Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, Beginning Balance	[1]	$ 51,141		$ 45,812		$ 55,726
Other comprehensive income (loss), net of tax		1,147		2,460		(10,581)
Equity, Ending Balance	[1]	54,469		51,141		45,812
Pretax loss from derivatives		275		293
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, Beginning Balance	[1]	(7,712)	[2]	(10,172)		409
Other comprehensive income (loss), net of tax		1,147		2,460		(10,581)
Equity, Ending Balance	[1]	(6,565)	[2]	(7,712)	[2]	(10,172)
Debt securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, Beginning Balance		(5,830)	[2]	(7,164)		589
Other comprehensive income (loss), net of tax		731		1,334		(7,753)
Equity, Ending Balance		(5,099)	[2]	(5,830)	[2]	(7,164)
Cash flow hedge derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, Beginning Balance		(1,713)	[2]	(2,705)		(201)
Other comprehensive income (loss), net of tax		399		992		(2,504)
Equity, Ending Balance		(1,314)	[2]	(1,713)	[2]	(2,705)
Pension and other postretirement benefit plan adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, Beginning Balance		(125)	[2]	(251)		27
Other comprehensive income (loss), net of tax		16		126		(278)
Equity, Ending Balance		(109)	[2]	(125)	[2]	(251)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, Beginning Balance		(44)	[2]	(52)		(6)
Other comprehensive income (loss), net of tax		1		8		(46)
Equity, Ending Balance		$ (43)	[2]	$ (44)	[2]	$ (52)

[1] The par value of our preferred stock outstanding was less than $0.5 million at each date and, therefore, is excluded from this presentation.

[2] AOCI included pretax losses of $275 million and $293 million from derivatives that hedged the purchase of investment securities classified as held-to-maturity at December 31, 2024 and December 31, 2023, respectively.