Derivatives - Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Notional or contractual amount	$ 1,034,422	$ 954,482
Derivative other receivable	107	91
Netting adjustments to derivative assets	(3,981)	(6,080)
Derivative Asset	1,466	501
Derivative other payable	0	0
Netting adjustments to derivative liabilities	$ 3,979	$ 6,282
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Derivative Liability	$ (781)	$ (954)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Notional or contractual amount	$ 908,514	$ 795,396
Derivative Asset, Fair Value	5,142	6,281
Derivative liabilities at fair value	(2,536)	(3,087)
Not Designated as Hedging Instrument, Economic Hedge | CDX Swaption
Derivative [Line Items]
Notional or contractual amount	6,400	6,800
Derivative Asset, Fair Value	1	1
Not Designated as Hedging Instrument, Economic Hedge | Swap
Derivative [Line Items]
Notional or contractual amount	557,848	382,761
Derivative Asset, Fair Value	1,148	1,512
Derivative liabilities at fair value	(306)	(340)
Not Designated as Hedging Instrument, Economic Hedge | Written Option | Written
Derivative [Line Items]
Notional or contractual amount	40,480	33,117
Derivative Asset, Fair Value	0	0
Derivative liabilities at fair value	(1,459)	(1,826)
Not Designated as Hedging Instrument, Economic Hedge | Purchased Options | Purchased
Derivative [Line Items]
Notional or contractual amount	108,030	126,750
Derivative Asset, Fair Value	3,893	4,649
Derivative liabilities at fair value	0	0
Not Designated as Hedging Instrument, Economic Hedge | Futures
Derivative [Line Items]
Notional or contractual amount	87,007	165,894
Derivative Asset, Fair Value	0	0
Derivative liabilities at fair value	0	0
Not Designated as Hedging Instrument, Economic Hedge | Mortgage commitments derivatives
Derivative [Line Items]
Notional or contractual amount	57,170	37,407
Derivative Asset, Fair Value	28	26
Derivative liabilities at fair value	(15)	(40)
Not Designated as Hedging Instrument, Economic Hedge | CRT-related derivatives
Derivative [Line Items]
Notional or contractual amount	26,883	28,962
Derivative Asset, Fair Value	0	0
Derivative liabilities at fair value	(155)	(186)
Not Designated as Hedging Instrument, Economic Hedge | Other
Derivative [Line Items]
Notional or contractual amount	31,096	20,505
Derivative Asset, Fair Value	73	94
Derivative liabilities at fair value	(601)	(695)
Not Designated as Hedging Instrument, Economic Hedge | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional or contractual amount	793,365	708,522
Derivative Asset, Fair Value	5,041	6,161
Derivative liabilities at fair value	(1,765)	(2,166)
Designated as Hedging Instrument | Fair Value Hedging
Derivative [Line Items]
Notional or contractual amount	125,908	159,086
Derivative Asset, Fair Value	198	209
Derivative liabilities at fair value	(2,224)	(4,149)
Designated as Hedging Instrument | Fair Value Hedging | Swap
Derivative [Line Items]
Notional or contractual amount	125,908	159,086
Derivative Asset, Fair Value	198	209
Derivative liabilities at fair value	$ (2,224)	$ (4,149)