CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 558	$ 494
Net unrealized losses on available-for-sale debt securities:
Unrealized holding gains (losses) arising during period	600	(1,929)
Reclassification adjustment for net gains losses included in net income	0	(2)
Net unrealized losses on cash flow hedge derivatives:
Unrealized holding gains (losses) arising during period	215	(313)
Reclassification adjustment for net losses (gains) included in net income	50	(60)
Defined benefit pension plans, net:
Reclassification of amounts to net periodic benefit costs	0	1
Other comprehensive income (loss), net of tax	865	(2,303)
Comprehensive Income (Loss)	$ 1,423	$ (1,809)