Income Taxes - Schedule of Components of Consolidated Statements of Income and Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Consolidated Statements of Income:
Income tax expense	$ 211	$ 212	$ 247
Income tax expense (benefit) related to:
Net unrealized gains (losses) on pension and other postretirement plans	7	(1)	(5)
Net unrealized gains (losses) on securities available for sale	17	44	(302)
Net unrealized gains (losses) on cash flow hedges	(5)	15	(42)
Total	$ 230	$ 270	$ (102)