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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 91 $ 80 $ 51
Additions 252 245 286
Deductions (248) (234) (257)
Other 0 0 0
Balance at End of Period 95 91 80
Deferred tax asset valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 13,945 13,971 13,920
Additions 241 81 2,204
Deductions (7,919) (107) (2,153)
Other 0 0 0
Balance at End of Period 6,267 13,945 13,971
Insurance reserves      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 6,986 4,754 4,028
Additions 4,489 3,544 2,128
Deductions (1,696) (1,526) (1,396)
Other 17 214 (6)
Balance at End of Period 9,796 6,986 4,754
Increase (decrease) for changes in estimates (78) 158 $ 152
Reserve amount covered $ 264 $ 248