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REPORTABLE SEGMENTS - Schedule of Revenues by Geography (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues and service charges (a) $ 39,321 $ 41,321 $ 33,817
U.S.      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues and service charges (a) 26,434 28,004 22,697
Non-U.S.      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues and service charges (a) $ 12,887 $ 13,317 $ 11,120