Reportable Operating Segments and Geographic Operations - Selected Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total non-interest revenues	$ 47,381	$ 42,967	$ 34,630
Revenue from contracts with customers	37,218	34,219	27,716
Interest income	19,983	12,658	9,033
Interest expense	6,849	2,763	1,283
Total revenues net of interest expense	60,515	52,862	42,380
Pretax income (loss)	10,513	9,585	10,689
Total assets	261,108	228,354	189,000
Corporate and Other
Segment Reporting Information [Line Items]
Total non-interest revenues	(106)	(54)	26
Revenue from contracts with customers	(37)	(7)	172
Interest income	2,186	655	165
Interest expense	2,283	758	208
Total revenues net of interest expense	(203)	(157)	(17)
Pretax income (loss)	(2,410)	(2,227)	(1,008)
Total assets	33,000	26,000	19,000
USCS | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	18,464	16,440	12,989
Revenue from contracts with customers	13,715	12,478	9,823
Interest income	12,336	8,457	6,328
Interest expense	2,684	983	395
Total revenues net of interest expense	28,116	23,914	18,922
Pretax income (loss)	5,433	5,400	5,958
Total assets	107,000	94,000	77,000
CS | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	12,931	12,196	9,833
Revenue from contracts with customers	11,379	10,844	8,659
Interest income	3,328	2,070	1,408
Interest expense	1,483	697	330
Total revenues net of interest expense	14,776	13,569	10,911
Pretax income (loss)	2,861	2,880	2,936
Total assets	55,000	51,000	45,000
ICS | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	9,472	8,262	6,761
Revenue from contracts with customers	6,155	5,301	4,368
Interest income	2,076	1,453	1,116
Interest expense	1,118	654	442
Total revenues net of interest expense	10,430	9,061	7,435
Pretax income (loss)	973	578	929
Total assets	42,000	37,000	33,000
GMNS | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	6,620	6,123	5,021
Revenue from contracts with customers	6,006	5,603	4,694
Interest income	57	23	16
Interest expense	(719)	(329)	(92)
Total revenues net of interest expense	7,396	6,475	5,129
Pretax income (loss)	3,656	2,954	1,874
Total assets	$ 24,000	$ 20,000	$ 15,000