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 ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional	$ 23,094,926,000	$ 23,932,603,000	$ 19,137,094,000	$ 8,076,933,000	$ 60,549,307,000	$ 48,445,497,000
Interest Rate Swaption [Member] \| Long [Member] \| Variable Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis		(7,210,000)
Fair Value		$ 2,448,000
Weighted Average Remaining Maturity		4 months 7 days
Interest Rate Swaption [Member] \| Long [Member] \| Variable Income Interest Rate [Member] \| Greater than or Equal to Six Months Remaining Maturity
Derivative [Line Items]
Cost Basis	(11,314,000)
Fair Value	$ 6,902,000
Weighted Average Remaining Maturity	11 months 9 days
Interest Rate Swaption [Member] \| Long [Member] \| Fixed Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis		$ (3,010,000)
Fair Value		$ 0
Weighted Average Remaining Maturity		29 days
Interest Rate Swaption [Member] \| Short [Member] \| Fixed Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Cost Basis		$ (2,600,000)
Fair Value		$ 3,044,000
Weighted Average Remaining Maturity		5 months 4 days
Interest Rate Swaption [Member] \| Short [Member] \| Fixed Income Interest Rate [Member] \| Greater than or Equal to Six Months Remaining Maturity
Derivative [Line Items]
Cost Basis	$ (10,640,000)
Fair Value	$ 12,790,000
Weighted Average Remaining Maturity	11 months 3 days
Underlying Swap [Member] \| Long [Member] \| Variable Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity		10 years
Notional		$ 2,800,000,000
Underlying Swap [Member] \| Long [Member] \| Variable Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Derivative [Line Items]
Weighted Average Fixed Interest Rate		1.32%
Underlying Swap [Member] \| Long [Member] \| Variable Income Interest Rate [Member] \| Greater than or Equal to Six Months Remaining Maturity
Derivative [Line Items]
Weighted Average Remaining Maturity	10 years
Notional	$ 886,000,000
Underlying Swap [Member] \| Long [Member] \| Variable Income Interest Rate [Member] \| Greater than or Equal to Six Months Remaining Maturity \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Derivative [Line Items]
Weighted Average Fixed Interest Rate	2.26%
Underlying Swap [Member] \| Long [Member] \| Fixed Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity		10 years
Notional		$ 2,000,000,000
Weighted Average Fixed Interest Rate		0.23%
Underlying Swap [Member] \| Short [Member] \| Fixed Income Interest Rate [Member] \| Less Than Six Months Remaining Maturity [Member]
Derivative [Line Items]
Weighted Average Remaining Maturity		10 years
Notional		$ 1,050,000,000
Weighted Average Fixed Interest Rate		0.55%
Underlying Swap [Member] \| Short [Member] \| Fixed Income Interest Rate [Member] \| Greater than or Equal to Six Months Remaining Maturity
Derivative [Line Items]
Weighted Average Remaining Maturity	10 years
Notional	$ 1,087,000,000
Weighted Average Fixed Interest Rate	1.26%