Income Taxes - Schedule of Components of Consolidated Statements of Income and Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense	$ 274	$ 76	$ 134
Net unrealized gains (losses) on pension and other postretirement plans	2	3	5
Net unrealized gains (losses) on securities available for sale	(46)	25	35
Net unrealized gains (losses) on cash flow hedges	(3)	3	5
Total	$ 227	$ 107	$ 179