Reportable Operating Segments and Geographic Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total non-interest revenues	$ 34,630	$ 28,102	$ 34,936
Revenue from contracts with customers	27,716	21,974	28,159
Interest income	9,033	10,083	12,084
Interest expense	1,283	2,098	3,464
Total revenues net of interest expense	42,380	36,087	43,556
Pretax income (loss)	10,689	4,296	8,429
Total assets	188,548	191,367	198,000
Corporate and Other
Segment Reporting Information [Line Items]
Total non-interest revenues	20	(325)	88
Revenue from contracts with customers	171	(27)	6
Interest income	166	280	743
Interest expense	209	507	1,002
Total revenues net of interest expense	(23)	(552)	(171)
Pretax income (loss)	(1,014)	(1,642)	(1,793)
Total assets	19,000	48,000	21,000
Global Consumer Services Group | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	18,157	14,632	17,178
Revenue from contracts with customers	13,047	9,974	12,555
Interest income	7,391	8,199	9,414
Interest expense	717	1,054	1,731
Total revenues net of interest expense	24,831	21,777	24,861
Pretax income (loss)	6,826	3,687	4,845
Total assets	102,000	87,000	107,000
Global Commercial Services | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	11,489	9,652	12,242
Revenue from contracts with customers	9,863	8,145	10,633
Interest income	1,460	1,586	1,900
Interest expense	449	619	1,034
Total revenues net of interest expense	12,500	10,619	13,108
Pretax income (loss)	2,928	936	2,692
Total assets	53,000	42,000	53,000
Global Merchant and Network Services | Operating Segments
Segment Reporting Information [Line Items]
Total non-interest revenues	4,964	4,143	5,428
Revenue from contracts with customers	4,635	3,882	4,965
Interest income	16	18	27
Interest expense	(92)	(82)	(303)
Total revenues net of interest expense	5,072	4,243	5,758
Pretax income (loss)	1,949	1,315	2,685
Total assets	$ 15,000	$ 14,000	$ 17,000