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Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Sep. 30, 2022  
Available for Sale at Fair value - Amortized cost $ 57,630 $ 55,873
Fixed maturity securities, available-for-sale 50,495 60,749
Collateral Fixed Maturity Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 414 100
Fixed maturity securities, available-for-sale 362 103
Collateral Received Fixed Maturity Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, available-for-sale 1,273 1,922
Reported Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Assets Held-in-trust 31,060 28,671
Estimate of Fair Value Measurement [Member]    
Debt Securities, Available-for-sale [Line Items]    
Assets Held-in-trust $ 26,993 $ 31,173