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Borrowings - Funding Facilities (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	May 10, 2022
Line of Credit Facility [Line Items]
Total Funding Facilities	$ 6,469,607,000	$ 12,751,592,000
Funding Facilities
Line of Credit Facility [Line Items]
Line Amount	24,450,000,000
Committed Line Amount	$ 4,150,000,000
Funding Facilities | Base rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%	1.00%
Funding Facilities | Base rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.85%	2.25%
Funding Facilities | MRA funding
Line of Credit Facility [Line Items]
Line Amount	$ 17,450,000,000
Committed Line Amount	4,150,000,000
Master Repurchase Agreements	4,136,649,000	$ 9,486,726,000
Funding Facilities | Master Repurchase Agreement Due Oct 20 2023
Line of Credit Facility [Line Items]
Line Amount	2,000,000,000
Committed Line Amount	100,000,000
Master Repurchase Agreements	246,476,000	249,119,000
Funding Facilities | Master Repurchase Agreement Due Oct 20 2023 | Subsequent event
Line of Credit Facility [Line Items]
Line Amount			$ 1,000,000,000
Funding Facilities | Master Repurchase Agreement Due Dec 01 2022
Line of Credit Facility [Line Items]
Line Amount	1,500,000,000
Committed Line Amount	250,000,000
Master Repurchase Agreements	576,521,000	1,328,727,000
Funding Facilities | Master Repurchase Agreement Due Apr 21 2023
Line of Credit Facility [Line Items]
Line Amount	2,250,000,000
Committed Line Amount	500,000,000
Master Repurchase Agreements	527,655,000	1,714,806,000
Funding Facilities | Master Repurchase Agreement Due Jan 26 2023
Line of Credit Facility [Line Items]
Line Amount	2,000,000,000
Committed Line Amount	1,200,000,000
Master Repurchase Agreements	$ 1,252,325,000	1,479,128,000
Facility term	12 months
Extension term	3 months
Timing option for extending facility	3 months
Funding Facilities | Master Repurchase Agreement Due Jan 26 2023 | Subsequent event
Line of Credit Facility [Line Items]
Line Amount			1,100,000,000
Funding Facilities | Master Repurchase Agreement Due Apr 20 2023
Line of Credit Facility [Line Items]
Line Amount	$ 3,000,000,000
Committed Line Amount	500,000,000
Master Repurchase Agreements	585,523,000	2,264,954,000
Funding Facilities | Master Repurchase Agreement Due Apr 20 2023 | Subsequent event
Line of Credit Facility [Line Items]
Line Amount			2,000,000,000
Committed Line Amount			250,000,000
Funding Facilities | Master Repurchase Agreement Due Sep 22 2023
Line of Credit Facility [Line Items]
Line Amount	2,000,000,000
Committed Line Amount	500,000,000
Master Repurchase Agreements	225,067,000	498,335,000
Funding Facilities | Master Repurchase Agreement Due Sep 22 2023 | Subsequent event
Line of Credit Facility [Line Items]
Committed Line Amount			250,000,000
Funding Facilities | Master Repurchase Agreement Due Sep 15 2023
Line of Credit Facility [Line Items]
Line Amount	1,200,000,000
Committed Line Amount	500,000,000
Master Repurchase Agreements	167,104,000	542,846,000
Funding Facilities | Master Repurchase Agreement Due Sep 15 2023 | Subsequent event
Line of Credit Facility [Line Items]
Line Amount			900,000,000
Committed Line Amount			$ 250,000,000
Funding Facilities | Master Repurchase Agreement Due Jun 10 2022
Line of Credit Facility [Line Items]
Line Amount	500,000,000
Committed Line Amount	0
Master Repurchase Agreements	0	0
Funding Facilities | Master Repurchase Agreement Due Sep 22 2023 Two
Line of Credit Facility [Line Items]
Line Amount	1,250,000,000
Committed Line Amount	250,000,000
Master Repurchase Agreements	243,482,000	539,257,000
Funding Facilities | Master Repurchase Agreement Due Aug 16 2023
Line of Credit Facility [Line Items]
Line Amount	750,000,000
Committed Line Amount	100,000,000
Master Repurchase Agreements	89,124,000	616,165,000
Funding Facilities | Master Repurchase Agreement Due Dec 16 2022
Line of Credit Facility [Line Items]
Line Amount	1,000,000,000
Committed Line Amount	250,000,000
Master Repurchase Agreements	223,372,000	253,389,000
Funding Facilities | Early Funding
Line of Credit Facility [Line Items]
Line Amount	7,000,000,000
Committed Line Amount	0
Early Funding Facilities	2,332,958,000	3,264,866,000
Funding Facilities | Early Funding Facility, one
Line of Credit Facility [Line Items]
Line Amount	4,000,000,000
Committed Line Amount	0
Early Funding Facilities	1,328,175,000	2,071,154,000
Funding Facilities | Early Funding Facility, two
Line of Credit Facility [Line Items]
Line Amount	3,000,000,000
Committed Line Amount	0
Early Funding Facilities	$ 1,004,783,000	$ 1,193,712,000
Timing for review of agreement	90 days

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