CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 2,314	$ 2,349	$ 2,446
Net unrealized losses on available-for-sale debt securities:
Unrealized holding gains (losses) arising during the year	15	494	(5,478)
Unrealized losses on available-for-sale debt securities transferred to held-to-maturity securities	785	0	0
Reclassification adjustment for net losses (gains) included in net income	14	1	(2)
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	(785)	0	0
Amortization of unrealized losses on available-for-sale debt securities transferred to held-to-maturity securities	101	0	0
Net unrealized losses on cash flow hedge derivatives:
Unrealized holding losses arising during the year	(552)	(131)	(774)
Reclassification adjustment for net losses (gains) included in net income	270	257	(77)
Defined benefit pension plans, net:
Net actuarial (loss) gain arising during the year	(2)	(1)	9
Reclassification of amounts to net periodic benefit costs	3	3	5
Other	2	0	0
Other comprehensive (loss) income, net of tax	(149)	623	(6,317)
Comprehensive Income (Loss)	$ 2,165	$ 2,972	$ (3,871)