Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	$ 15,045,799,000		$ 17,159,801,000
Net Short Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount		$ 14,262,996,000
Inverse Interest-Only Securities [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	163,735,000	196,456,000	247,101,000
Interest Rate Swap [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	17,788,114,000	0	20,387,300,000
Interest Rate Swaption [Member] | Net Short Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	200,000,000	0	1,761,000,000
TBAs [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	3,497,000,000	3,826,000,000	4,116,000,000
Futures [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Futures [Member] | Net Short Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	6,203,050,000	18,285,452,000	$ 5,829,600,000
Derivative assets
Derivative, Fair Value, Net [Abstract]
Fair Value	85,291,000	26,438,000
Derivative assets | Net Short Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	2,942,735,000	18,738,996,000
Derivative assets | Inverse Interest-Only Securities [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	12,292,000	15,293,000
Derivative assets | Inverse Interest-Only Securities [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	163,735,000	196,456,000
Derivative assets | Interest Rate Swap [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Derivative assets | Interest Rate Swap [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	0	0
Derivative assets | Interest Rate Swaption [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	19,000	0
Derivative assets | Interest Rate Swaption [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount		0
Derivative assets | Interest Rate Swaption [Member] | Net Short Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	200,000,000
Derivative assets | TBAs [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	72,980,000	11,145,000
Derivative assets | TBAs [Member] | Net Long Position [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	72,980,000	11,145,000
Derivative assets | TBAs [Member] | Net Short Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	2,979,000,000	650,000,000
Derivative assets | Futures [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Derivative assets | Futures [Member] | Net Short Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	0	18,285,452,000
Derivative liabilities
Derivative, Fair Value, Net [Abstract]
Fair Value	(21,506,000)	(34,048,000)
Derivative liabilities | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	12,103,064,000	4,476,000,000
Derivative liabilities | Inverse Interest-Only Securities [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Derivative liabilities | Inverse Interest-Only Securities [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	0	0
Derivative liabilities | Interest Rate Swap [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Derivative liabilities | Interest Rate Swap [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	17,788,114,000	0
Derivative liabilities | Interest Rate Swaption [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Derivative liabilities | Interest Rate Swaption [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	0	0
Derivative liabilities | TBAs [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	(21,506,000)	(34,048,000)
Derivative liabilities | TBAs [Member] | Net Long Position [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	(21,506,000)	(34,048,000)
Notional Disclosures [Abstract]
Derivative, Notional Amount	518,000,000	4,476,000,000
Derivative liabilities | Futures [Member]
Derivative, Fair Value, Net [Abstract]
Fair Value	0	0
Derivative liabilities | Futures [Member] | Net Long Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount		$ 0
Derivative liabilities | Futures [Member] | Net Short Position [Member]
Notional Disclosures [Abstract]
Derivative, Notional Amount	$ 6,203,050,000