CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 2,349	$ 2,446	$ 2,770
Net unrealized (losses) gains on available-for-sale debt securities:
Unrealized holding gains (losses) arising during the year	494	(5,478)	(1,043)
Reclassification adjustment for net losses (gains) included in net income	1	(2)	3
Net unrealized (losses) gains on cash flow hedge derivatives:
Unrealized holding losses arising during the year	(131)	(774)	(142)
Reclassification adjustment for net losses (gains) included in net income	257	(77)	(223)
Defined benefit pension plans, net:
Net actuarial (loss) gain arising during the year	(1)	9	4
Reclassification of amounts to net periodic benefit costs	3	5	7
Other comprehensive income (loss), net of tax	623	(6,317)	(1,394)
Comprehensive Income (Loss)	$ 2,972	$ (3,871)	$ 1,376