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RELATED PARTY TRANSACTIONS - Schedule of Transactions with Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Related Party Transaction [Line Items]    
Revenues and service charges $ 8,979 $ 9,958
Expenses 9,016 10,225
Distributions to noncontrolling interests and redeemable noncontrolling interests 157 130
Related Party    
Related Party Transaction [Line Items]    
Revenues and service charges 214 653
Expenses 68 77
Distributions to noncontrolling interests and redeemable noncontrolling interests $ 157 $ 130