CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 2,770	$ 1,427	$ 2,512
Net unrealized gains on available-for-sale debt securities:
Unrealized holding (losses) gains arising during the year	(1,043)	1,153	1,046
Reclassification adjustment for net losses (gains) included in net income	3	(34)	(7)
Net unrealized gains on cash flow hedge derivatives:
Unrealized holding (losses) gains arising during the year	(142)	483	275
Reclassification adjustment for net gains included in net income	(223)	(187)	(13)
Defined benefit pension plans, net:
Net actuarial gain (loss) arising during the year	4	(9)	(5)
Reclassification of amounts to net periodic benefit costs	7	7	8
Other	0	(4)	0
Other comprehensive (loss) income, net of tax	(1,394)	1,409	1,304
Comprehensive Income	$ 1,376	$ 2,836	$ 3,816