Income Taxes - Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 95	$ 177	$ 224
Income tax expense (benefit) included in common equity related to:
Unrealized gains (losses) on investment securities	166	(719)	(258)
Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread	(8)	19	4
Unrealized gains (losses) on derivatives designated as cash flow hedges	43	(84)	(19)
Employer accounting for post-retirement plans	1	2	1
Total income taxes	$ 297	$ (605)	$ (48)