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RELATED PARTY TRANSACTIONS - Schedule of Transactions with Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Related Party Transaction [Line Items]        
Revenues and service charges $ 9,812 $ 9,713 $ 18,791 $ 19,671
Expenses 9,997 19,921 19,013 30,146
Distributions to noncontrolling interests and redeemable noncontrolling interests     174 161
Related Party        
Related Party Transaction [Line Items]        
Revenues and service charges 161 239 375 892
Expenses 84 83 152 160
Distributions to noncontrolling interests and redeemable noncontrolling interests $ 17 $ 31 $ 174 $ 161