TWO Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Schedule of Notional Amounts of Derivative Positions (Details)

Schedule of Notional Amounts of Derivative Positions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	$ (37,366,610)invest_DerivativeNotionalAmount	$ (22,377,656)invest_DerivativeNotionalAmount
Derivative, Notional Amount, Additions	83,937,800two_DerivativeNotionalAmountAdditions	68,614,416two_DerivativeNotionalAmountAdditions
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	(73,188,887)	(53,625,462)
Derivative, Notional Amount, Ending Balance	(48,115,523)invest_DerivativeNotionalAmount	(37,366,610)invest_DerivativeNotionalAmount
Derivative, Average Notional Amount	48,367,024two_DerivativeAverageNotionalAmount	34,518,856two_DerivativeAverageNotionalAmount
Gain (Loss) on Sale of Derivatives	(111,750)us-gaap_GainLossOnSaleOfDerivatives	96,312us-gaap_GainLossOnSaleOfDerivatives
Inverse Interest-Only Securities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	(1,525,845)	(1,909,351)
Derivative, Notional Amount, Additions	29,372	245,260
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	(386,991)	(628,766)
Derivative, Notional Amount, Ending Balance	(1,168,226)	(1,525,845)
Derivative, Average Notional Amount	1,324,581	1,782,306
Gain (Loss) on Sale of Derivatives	414	0
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	(19,619,000)	(14,070,000)
Derivative, Notional Amount, Additions	24,215,598	27,787,000
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	(25,250,598)	(22,238,000)
Derivative, Notional Amount, Ending Balance	(18,584,000)	(19,619,000)	(14,070,000)
Derivative, Average Notional Amount	23,329,504	16,965,918	9,891,749
Gain (Loss) on Sale of Derivatives	(803)	41,096
Credit Default Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	(427,073)	(438,440)
Derivative, Notional Amount, Additions	0	2,500,000
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	(302,073)	(2,511,367)
Derivative, Notional Amount, Ending Balance	(125,000)	(427,073)
Derivative, Average Notional Amount	138,418	1,031,857
Gain (Loss) on Sale of Derivatives	(13,705)	(53,154)
Interest Rate Swaption [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	(5,130,000)	(4,950,000)
Derivative, Notional Amount, Additions	15,860,000	420,000
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	(8,580,000)	(240,000)
Derivative, Notional Amount, Ending Balance	(12,410,000)	(5,130,000)
Derivative, Average Notional Amount	9,460,438	5,592,274
Gain (Loss) on Sale of Derivatives	(54,586)	(28,803)
Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	(603,000)	(953,000)
Derivative, Notional Amount, Additions	(10,882,000)	2,734,000
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	8,954,000	(3,084,000)
Derivative, Notional Amount, Ending Balance	(1,325,000)	(603,000)
Derivative, Average Notional Amount	827,140	677,180
Gain (Loss) on Sale of Derivatives	(33,985)	157,696
Options Held [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	0	0
Derivative, Notional Amount, Additions	5,500,000	3,748,000
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	(3,500,000)	(3,748,000)
Derivative, Notional Amount, Ending Balance	(2,000,000)	0
Derivative, Average Notional Amount	772,603	420,334
Gain (Loss) on Sale of Derivatives	(13,555)	7,798
Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	(10,000,000)	0
Derivative, Notional Amount, Additions	46,000,000	31,000,000
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	(42,000,000)	(21,000,000)
Derivative, Notional Amount, Ending Balance	(14,000,000)	(10,000,000)
Derivative, Average Notional Amount	11,715,068	7,972,527
Gain (Loss) on Sale of Derivatives	1,037	(7,665)
Total Return Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	(49,629)	0
Derivative, Notional Amount, Additions	586,550	50,574
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	(37,720)	(945)
Derivative, Notional Amount, Ending Balance	(598,459)	(49,629)
Derivative, Average Notional Amount	437,604	12,313
Gain (Loss) on Sale of Derivatives	0	0
Short US Treasury Securities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	0	0
Derivative, Notional Amount, Additions	(125,000)	(400,000)
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	125,000	400,000
Derivative, Notional Amount, Ending Balance	0	0
Derivative, Average Notional Amount	342	6,658
Gain (Loss) on Sale of Derivatives	2	(876)
Forward Purchase Commitments [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount, Beginning Balance	(12,063)	(56,865)
Derivative, Notional Amount, Additions	2,753,280	529,582
Derivative, Notional Amount, Settlement Termination Expiration or Exercise	(2,210,505)	(574,384)
Derivative, Notional Amount, Ending Balance	(554,838)	(12,063)
Derivative, Average Notional Amount	361,326	57,489
Gain (Loss) on Sale of Derivatives	$ 3,431	$ (19,780)