Reportable Operating Segments and Geographic Operations - Geographic Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items]
Total revenues net of interest expense	$ 60,515	$ 52,862	$ 42,380
Pretax income (loss) from continuing operations	10,513	9,585	10,689
United States
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items]
Total revenues net of interest expense	47,140	41,396	33,103
Pretax income (loss) from continuing operations	10,717	10,383	10,325
EMEA
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items]
Total revenues net of interest expense	5,633	4,871	3,643
Pretax income (loss) from continuing operations	854	550	460
APAC
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items]
Total revenues net of interest expense	4,372	3,835	3,418
Pretax income (loss) from continuing operations	592	376	420
LACC
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items]
Total revenues net of interest expense	3,571	2,917	2,238
Pretax income (loss) from continuing operations	760	500	494
Other Unallocated
Segment Revenues And Pretax Income Loss By Geographic Location [Line Items]
Total revenues net of interest expense	(201)	(157)	(22)
Pretax income (loss) from continuing operations	$ (2,410)	$ (2,224)	$ (1,010)