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

Derivative Instruments and Hedging Activities Commitments to Purchase Residential Mortgage Loans Held-for-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative, Notional Amount	$ 21,998,381	$ 48,115,523	$ 37,366,610
Loan Purchase Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	286,120	554,838	$ 12,063
Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Derivative, Notional Amount	21,735,997	36,315,523
Derivative, Fair Value, Net	271,509	380,791
Derivative Financial Instruments, Assets [Member] \| Loan Purchase Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	98,736
Derivative, Fair Value, Net	77	1,297
Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,362,384	16,200,000
Derivative, Fair Value, Net	(7,285)	(90,233)
Derivative Financial Instruments, Liabilities [Member] \| Loan Purchase Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	187,384	0
Derivative, Fair Value, Net	$ (427)	$ 0