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Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate $ 5,787 $ 5,706    
Policy loans 1,258 1,319    
Funds withheld at interest 5,432 5,662    
Cash and cash equivalents 3,408 1,449 $ 1,890 $ 1,304
Short-term investments 227 64    
Other invested assets 2,829 2,363    
Accrued investment income 511 493    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 23,276 22,711    
Collateral finance and securitization notes 388 598    
Carrying Value [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate [1] 5,787 5,706    
Policy loans [1] 1,258 1,319    
Funds withheld at interest [1] 5,292 5,526    
Cash and cash equivalents [1] 1,930 1,175    
Short-term investments [1] 30 32    
Other invested assets [1] 1,482 1,259    
Accrued investment income [1] 511 493    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities [1] 18,106 19,163    
Long And Short Term Debt [1] 3,573 2,981    
Collateral finance and securitization notes [1] 388 598    
Estimate of Fair Value Measurement [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 6,167 5,935    
Policy loans 1,258 1,319    
Funds withheld at interest 5,676 5,870    
Cash and cash equivalents 1,930 1,175    
Short-term investments 30 32    
Other invested assets 1,601 1,278    
Accrued investment income 511 493    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 19,683 21,542    
Long And Short Term Debt 3,901 3,179    
Collateral finance and securitization notes 351 551    
Estimate of Fair Value Measurement [Member] | Net Asset Value [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 0 0    
Policy loans 0 0    
Funds withheld at interest 0 0    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 489 402    
Accrued investment income 0 0    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 0 0    
Long And Short Term Debt 0 0    
Collateral finance and securitization notes 0 0    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 0 0    
Policy loans 0 0    
Funds withheld at interest 0 0    
Cash and cash equivalents 1,930 1,175    
Short-term investments 30 32    
Other invested assets 5 5    
Accrued investment income 0 0    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 0 0    
Long And Short Term Debt 0 0    
Collateral finance and securitization notes 0 0    
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 0 0    
Policy loans 1,258 1,319    
Funds withheld at interest 0 0    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 89 68    
Accrued investment income 511 493    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 0 0    
Long And Short Term Debt 0 0    
Collateral finance and securitization notes 0 0    
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 6,167 5,935    
Policy loans 0 0    
Funds withheld at interest 5,676 5,870    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 1,018 803    
Accrued investment income 0 0    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 19,683 21,542    
Long And Short Term Debt 3,901 3,179    
Collateral finance and securitization notes $ 351 $ 551    
[1] Carrying values presented herein may differ from those in the Company’s consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.