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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Policy Acquisition Cost [Line Items]      
Balance, beginning of period $ 785 $ 670 $ 650
Deferred costs 1,666 1,635 1,404
Amortization — DAC (1,706) (1,622) (1,384)
Balance, end of period 789 785 670
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Continental Europe Operations [Member]      
Deferred Policy Acquisition Cost [Line Items]      
DAC transferred to assets held for sale (3) 0 0
The Navigators Group, Inc. [Member] | Customer relationships      
Deferred Policy Acquisition Cost [Line Items]      
Add back amortization of value of business acquired [1] $ 47 $ 102 $ 0