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Deferred Policy Acquisition Costs (Movement Analysis Of Deferred Policy Acquisition Costs) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Deferred Policy Acquisition Cost $ 3,512 $ 3,398 $ 3,240
Deferred Policy Acquisition Cost, Capitalization 478 526 608
Deferred Policy Acquisition Costs, Amortization Expense (405) (315) (438)
Deferred Policy Acquisition Cost, Amortization Expense, Other 22 (15) 14
Deferred Policy Acquisition Cost, Amortization Expense, Unrealized Investment Gains (Losses) (26) (97) 27
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment 35 15 (53)
Deferred Policy Acquisition Cost $ 3,616 $ 3,512 $ 3,398