CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 494	$ 694
Net unrealized (losses) gains on available-for-sale debt securities:
Unrealized holding losses arising during period	(1,929)	(700)
Reclassification adjustment for net (gains) losses included in net income	(2)	11
Net unrealized (losses) gains on cash flow hedge derivatives:
Unrealized holding losses arising during period	(313)	(64)
Reclassification adjustment for net gains included in net income	(60)	(57)
Defined benefit pension plans, net:
Reclassification of amounts to net periodic benefit costs	1	1
Other comprehensive loss, net of tax	(2,303)	(809)
Comprehensive Loss	$ (1,809)	$ (115)