Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 1,240	$ 922	$ 2,501	$ 2,122
OCI, net of tax:
Net change in net pension and postretirement costs	2	34	7	35
Net change in cash flow hedges	275	(38)	704	(228)
Net change in AFS securities	16	4,664	494	4,088
Net change in HTM securities	59	57	109	108
Other, net	5	1	6	(1)
Total OCI, net of tax	357	4,718	1,320	4,002
Total comprehensive income	1,597	5,640	3,821	6,124
Income Tax Effect of Items Included in OCI:
Net change in net pension and postretirement costs	(1)	11	0	11
Net change in cash flow hedges	84	(12)	217	(70)
Net change in AFS securities	(10)	1,439	139	1,262
Net change in HTM securities	12	18	27	33
Total income taxes related to OCI	$ 85	$ 1,456	$ 383	$ 1,236