Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Derivatives - Derivative Gains and Losses (Details) - Not Designated as Hedging Instrument, Economic Hedge - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ 138	$ (207)	$ 692	$ (733)
Interest-rate management derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	194	(155)	577	(728)
Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	178	(98)	481	(415)
Written options \| Written
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	79	94	73	220
Purchased options \| Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(159)	(141)	(144)	(357)
Futures
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	96	(10)	167	(176)
Mortgage commitment derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	(60)	(75)	162	(183)
CRT-Related Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	24	(28)	56	16
Other
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$ (20)	$ 51	$ (103)	$ 162