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RELATED PARTY TRANSACTIONS - Schedule of Transactions with Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party Transaction [Line Items]        
Revenues and service charges $ 9,045 $ 9,623 $ 27,836 $ 29,294
Expenses 8,434 9,342 27,447 39,488
Distributions to noncontrolling interests and redeemable noncontrolling interests     188 172
Related Party        
Related Party Transaction [Line Items]        
Revenues and service charges 194 237 569 1,129
Expenses 39 58 191 218
Distributions to noncontrolling interests and redeemable noncontrolling interests $ 14 $ 11 $ 188 $ 172