Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 584	$ 531
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized gains (losses) on investment securities	147	(10)
Cash flow hedges adjustments	108	(117)
Defined benefit plans liability adjustments	(2)	(1)
Other	1	(2)
Total other comprehensive income (loss)	254	(130)
Total comprehensive income	$ 838	$ 401