CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 660	$ 653	$ 1,819	$ 1,709
Net unrealized losses on available-for-sale debt securities:
Unrealized holding losses arising during period	(1,218)	(2,129)	(1,252)	(5,564)
Reclassification adjustment for net losses (gains) included in net income	0	0	1	(2)
Net unrealized losses on cash flow hedge derivatives:
Unrealized holding losses arising during period	(527)	(530)	(664)	(840)
Reclassification adjustment for net losses (gains) included in net income	72	(3)	185	(109)
Defined benefit pension plans, net:
Net actuarial loss arising during the year	0	(1)	0	(2)
Reclassification of amounts to net periodic benefit costs	0	1	1	4
Other comprehensive loss, net of tax	(1,673)	(2,662)	(1,729)	(6,513)
Comprehensive Income (Loss)	$ (1,013)	$ (2,009)	$ 90	$ (4,804)