TWO Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaptions (Details)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaptions (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional	$ 60,549,307,000	$ 55,549,424,000	$ 8,076,933,000	$ 48,445,497,000	$ 58,777,783,000	$ 36,528,169,000
Interest Rate Swaption [Member] \| Long [Member] \| Variable Income Interest Rate [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity	3 months 6 days
Interest Rate Swaption [Member] \| Long [Member] \| Variable Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis				(24,700,000)
Fair Value				16,095,000
Weighted Average Remaining Maturity	3 months 6 days
Interest Rate Swaption [Member] \| Long [Member] \| Fixed Income Interest Rate [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity	1 month 3 days
Interest Rate Swaption [Member] \| Long [Member] \| Fixed Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis				(4,100,000)
Fair Value				342,000
Weighted Average Remaining Maturity		1 month 3 days
Interest Rate Swaption [Member] \| Short [Member] \| Fixed Income Interest Rate [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity	3 months 7 days
Interest Rate Swaption [Member] \| Short [Member] \| Fixed Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis				(20,800,000)
Fair Value				8,636,000
Weighted Average Remaining Maturity	3 months 7 days
Underlying Swap [Member] \| Long [Member] \| Variable Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Notional				$ 7,525,000,000
Weighted Average Remaining Maturity	10 years
Underlying Swap [Member] \| Long [Member] \| Variable Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted Average Fixed Interest Rate				2.27%
Underlying Swap [Member] \| Long [Member] \| Fixed Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Notional				$ 500,000,000
Weighted Average Remaining Maturity	10 years
Weighted Average Fixed Interest Rate				1.55%
Underlying Swap [Member] \| Short [Member] \| Fixed Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Notional				$ 6,768,000,000
Weighted Average Remaining Maturity	10 years
Underlying Swap [Member] \| Short [Member] \| Fixed Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Weighted Average Fixed Interest Rate				1.28%