CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 601	$ 601	$ 1,122	$ 1,159
Net unrealized losses on available-for-sale debt securities:
Unrealized holding losses arising during period	(1)	(633)	(182)	(33)
Unrealized losses on available-for-sale debt securities transferred to held-to-maturity securities	0	0	785	0
Reclassification adjustment for net losses included in net income	3	0	5	0
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	(785)	0
Amortization of unrealized losses on available-for-sale debt securities transferred to held-to-maturity securities	25	0	50	0
Net unrealized losses on cash flow hedge derivatives:
Unrealized holding losses arising during period	(109)	(352)	(425)	(137)
Reclassification adjustment for net losses included in net income	69	63	138	113
Defined benefit pension plans, net:
Reclassification of amounts to net periodic benefit costs	0	1	0	1
Other comprehensive loss, net of tax	(13)	(921)	(414)	(56)
Comprehensive Income (Loss)	$ 588	$ (320)	$ 708	$ 1,103