CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 601	$ 562	$ 1,159	$ 1,056
Net unrealized losses on available-for-sale debt securities:
Unrealized holding losses arising during period	(633)	(1,506)	(33)	(3,435)
Reclassification adjustment for net gains included in net income	0	0	0	(2)
Net unrealized losses on cash flow hedge derivatives:
Unrealized holding (losses) gains arising during period	(352)	2	(137)	(310)
Reclassification adjustment for net losses (gains) included in net income	63	(45)	113	(106)
Defined benefit pension plans, net:
Net actuarial loss arising during the year	0	(1)	0	(1)
Reclassification of amounts to net periodic benefit costs	1	2	1	3
Other comprehensive loss, net of tax	(921)	(1,548)	(56)	(3,851)
Comprehensive Income (Loss)	$ (320)	$ (986)	$ 1,103	$ (2,795)