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Policy Claims and Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Liability for Claims and Claims Adjustment Expense $ 8,284 $ 6,904 $ 7,556 $ 6,786
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (732) (580) (641) (564)
Liability For Unpaid Claims And Claims Adjustment Expense Net Of Recoverable 7,552 6,324 $ 6,915 $ 6,222
Current Year Claims and Claims Adjustment Expense 4,097 2,838    
Prior Year Claims and Claims Adjustment Expense (59) (11)    
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 4,038 2,849    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year (164) (131)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years (3,196) (2,342)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (3,360) (2,473)    
Interest On Liability For Policy And Contract Claims 10 9    
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) (51) (283)    
Liability for Unpaid Claims and Claims Adjustment Expense Other $ (41) $ (274)