v3.22.0.1
Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 55 $ 34 $ 34
Additions 246 178 195
Deductions (250) (157) (195)
Balance at End of Period 51 55 34
Deferred tax asset valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 13,410 9,855 1,294
Additions 571 3,655 8,616
Deductions (61) (100) (55)
Balance at End of Period 13,920 13,410 9,855
Insurance reserves      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 3,466 3,418 2,937
Additions 1,696 950 1,451
Deductions (1,174) (902) (970)
Balance at End of Period 3,988 3,466 3,418
Increase (decrease) for changes in estimates 69 $ 35 $ 9
Increase (decrease) for reserves assumed with loss portfolio transfer reinsurance agreement $ 374