CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net Income	$ 649	$ 573	$ 1,791	$ 1,694
Net unrealized losses on available-for-sale debt securities:
Unrealized holding gains arising during period	230	944	890	763
Unrealized losses on available-for-sale debt securities transferred to held-to-maturity securities	0	0	0	785
Reclassification adjustment for net losses included in net income	0	9	0	13
Net unrealized losses on available-for-sale debt securities transferred to held-to-maturity securities:
Unrealized losses on available-for-sale debt securities transferred to held-to-maturity securities	0	0	0	(785)
Amortization of unrealized losses on available-for-sale debt securities transferred to held-to-maturity securities	25	26	72	76
Net unrealized losses on cash flow hedge derivatives:
Unrealized holding gains (losses) arising during period	(19)	403	284	(22)
Reclassification adjustment for net losses included in net income	33	70	113	208
Defined benefit pension plans, net:
Net actuarial loss arising during the year	(1)	0	(1)	0
Reclassification of amounts to net periodic benefit costs	2	1	2	1
Other comprehensive income, net of tax	0	2	0	2
Other comprehensive income (loss), net of tax	270	1,455	1,360	1,041
Comprehensive Income	$ 919	$ 2,028	$ 3,151	$ 2,735