Reportable Operating Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total non-interest revenues	$ 10,978	$ 8,934	$ 31,549	$ 24,593
Revenue from contracts with customers	8,733	7,138	25,144	19,553
Interest income	3,374	2,301	8,693	6,633
Interest expense	796	307	1,556	991
Total revenues net of interest expense	13,556	10,928	38,686	30,235
Pretax segment income (loss)	2,459	2,450	7,714	8,383
Total assets	214,915	184,000	214,915	184,000	$ 188,548
Corporate and Other
Segment Reporting Information [Line Items]
Total non-interest revenues	(28)	(22)	(28)	(154)
Revenue from contracts with customers	(13)	(6)	14	(18)
Interest income	201	41	330	127
Interest expense	240	47	391	180
Total revenues net of interest expense	(67)	(28)	(89)	(207)
Pretax segment income (loss)	(582)	(282)	(1,589)	(801)
Total assets	31,000	31,000	31,000	31,000
USCS | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	4,233	3,372	12,024	9,291
Revenue from contracts with customers	3,200	2,566	9,139	6,967
Interest income	2,251	1,613	5,880	4,647
Interest expense	274	89	513	310
Total revenues net of interest expense	6,210	4,896	17,391	13,628
Pretax segment income (loss)	1,309	1,251	4,114	4,677
Total assets	85,000	68,000	85,000	68,000
CS | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	3,145	2,558	8,986	7,053
Revenue from contracts with customers	2,791	2,250	8,003	6,174
Interest income	552	365	1,435	1,020
Interest expense	201	81	409	253
Total revenues net of interest expense	3,496	2,842	10,012	7,820
Pretax segment income (loss)	774	699	2,333	2,219
Total assets	51,000	41,000	51,000	41,000
ICS | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	2,066	1,732	6,065	4,814
Revenue from contracts with customers	1,332	1,116	3,857	3,060
Interest income	364	278	1,035	827
Interest expense	178	114	445	309
Total revenues net of interest expense	2,252	1,896	6,655	5,332
Pretax segment income (loss)	166	269	593	889
Total assets	33,000	30,000	33,000	30,000
GMNS | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	1,562	1,294	4,502	3,589
Revenue from contracts with customers	1,423	1,212	4,131	3,370
Interest income	6	4	13	12
Interest expense	(97)	(24)	(202)	(61)
Total revenues net of interest expense	1,665	1,322	4,717	3,662
Pretax segment income (loss)	792	513	2,263	1,399
Total assets	$ 15,000	$ 14,000	$ 15,000	$ 14,000