Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 1,200	$ 1,515
OCI, net of tax:
Net change in net pension and postretirement costs	1	(14)
Net change in cash flow hedges	(190)	125
Net change in AFS securities	(576)	853
Net change in HTM securities	51	55
Other, net	(2)	1
Total OCI, net of tax	(716)	1,020
Total OCI	484	2,535
Income Tax Effect of Items Included in OCI:
Net change in net pension and postretirement costs	0	(3)
Net change in cash flow hedges	(58)	38
Net change in AFS securities	(177)	262
Net change in HTM securities	15	15
Total income taxes related to OCI	$ (220)	$ 312