Consolidated Statements of Comprehensive Income - 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	$ 1,532	$ 1,658	$ 2,948	$ 3,131
OCI, net of tax:
Net change in net pension and postretirement costs	5	(2)	13	33
Net change in cash flow hedges	49	10	54	46
Net change in AFS securities	(2,849)	459	(7,838)	(1,845)
Net change in HTM securities	92	0	136	0
Other, net	(2)	1	(1)	2
Total OCI, net of tax	(2,705)	468	(7,636)	(1,764)
Total comprehensive income	(1,173)	2,126	(4,688)	1,367
Income Tax Effect of Items Included in OCI:
Net change in net pension and postretirement costs	3	(1)	5	10
Net change in cash flow hedges	15	3	16	14
Net change in AFS securities	(867)	139	(2,380)	(568)
Net change in HTM securities	27	0	40	0
Other, net	0	0	0	0
Total income taxes related to OCI	$ (822)	$ 141	$ (2,319)	$ (544)