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RELATED PARTY TRANSACTIONS - Schedule of Transactions with Related Parties (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Related Party Transaction [Line Items]      
Revenues and service charges (a) $ 39,321 $ 41,321 $ 33,817
Expenses 49,353 42,869 41,187
Distributions to noncontrolling interests and redeemable noncontrolling interests 193 301 300
Related Party      
Related Party Transaction [Line Items]      
Revenues and service charges (a) 1,404 2,790 2,533
Expenses 268 357 406
Distributions to noncontrolling interests and redeemable noncontrolling interests $ 193 $ 301 $ 300