CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Reclassification of unrealized losses on cash flow hedges from accumulated other comprehensive income (loss) to net income, tax expense (benefit)	$ (1)	$ (2)	$ (2)
Net unrealized gains (losses) on securities still held, tax expense (benefit)	6	(29)	(4)
Reclassification from accumulated other comprehensive income (loss) to net income, tax expense (benefit)	(4)	(3)	2
Net gain (loss) and prior service benefit (cost), tax expense (benefit)	7	(41)	30
Reclassification from accumulated other comprehensive income (loss) to net income	0	(2)	(1)
Other comprehensive income (loss) related to equity method investee, tax expense (benefit)	$ 0	$ 0	$ 1