v3.24.0.1
Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 80 $ 51 $ 55
Additions 245 286 246
Deductions (234) (257) (250)
Balance at End of Period 91 80 51
Deferred tax asset valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 13,971 13,920 13,410
Additions 81 2,204 571
Deductions (107) (2,153) (61)
Balance at End of Period 13,945 13,971 13,920
Insurance reserves      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 4,720 3,988 3,466
Additions 3,544 2,128 1,696
Deductions (1,526) (1,396) (1,174)
Balance at End of Period 6,738 4,720 3,988
Increase (decrease) for changes in estimates $ 158 $ 152 69
Increase (decrease) for reserves assumed with loss portfolio transfer reinsurance agreement     $ 374