Income Taxes - Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ 224	$ (42)	$ 157
Income tax expense (benefit) included in common equity related to:
Unrealized gains (losses) on investment securities	(258)	274	128
Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread	4	8	(98)
Unrealized gains (losses) on derivatives designated as cash flow hedges	(19)	23	3
Employer accounting for post-retirement plans	1	(1)	(5)
Total income taxes	$ (48)	$ 262	$ 185