CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 562	$ 709	$ 1,056	$ 1,403
Net unrealized (losses) gains on available-for-sale debt securities:
Unrealized holding (losses) gains arising during period	(1,506)	235	(3,435)	(466)
Reclassification adjustment for net (gains) losses included in net income	0	(5)	(2)	7
Net unrealized (losses) gains on cash flow hedge derivatives:
Unrealized holding (losses) gains arising during period	2	9	(310)	(55)
Reclassification adjustment for net gains included in net income	(45)	(58)	(106)	(115)
Defined benefit pension plans, net:
Net actuarial loss arising during the year	(1)	(1)	(1)	(1)
Reclassification of amounts to net periodic benefit costs	2	2	3	3
Other comprehensive (loss) income, net of tax	(1,548)	182	(3,851)	(627)
Comprehensive (Loss) Income	$ (986)	$ 891	$ (2,795)	$ 776