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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2018
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate $ 6,590 $ 6,283    
Policy loans 1,231 1,234    
Funds withheld at interest 6,003 6,954    
Cash and cash equivalents 2,927 2,948 $ 3,408 $ 1,449
Short-term investments 154 87    
Other invested assets 1,140 1,074    
Accrued investment income 630 533    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 30,572 26,377    
Funds Held under Reinsurance Agreements, Liability 361 61    
Collateral finance and securitization notes 0 180    
Carrying Value [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate [1] 6,590 6,283    
Policy loans [1] 1,231 1,234    
Funds withheld at interest [1] 6,319 6,747    
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures 49 63    
Cash and cash equivalents [1] 1,392 1,810    
Short-term investments [1] 33 23    
Other invested assets [1] 947 847    
Accrued investment income [1] 630 533    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities [1] 23,493 18,625    
Funds Held under Reinsurance Agreements, Liability 1,596 1,658    
Long And Short Term Debt [1] 3,961 3,667    
Collateral finance and securitization notes [1]   180    
Estimate of Fair Value Measurement [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 6,109 6,580    
Policy loans 1,231 1,234    
Funds withheld at interest 5,884 7,075    
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures 52 81    
Cash and cash equivalents 1,392 1,810    
Short-term investments 33 23    
Other invested assets 758 826    
Accrued investment income 630 533    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 23,065 19,540    
Funds Held under Reinsurance Agreements, Liability 1,321 1,657    
Long And Short Term Debt 3,670 3,886    
Collateral finance and securitization notes   153    
Fair Value, Inputs, Level 1 [Member]        
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Funds Held under Reinsurance Agreements, Liability 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    
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures 0 0    
Cash and cash equivalents 1,392 1,810    
Short-term investments 33 23    
Other invested assets 4 6    
Accrued investment income 0 0    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 0 0    
Funds Held under Reinsurance Agreements, Liability 0 0    
Long And Short Term Debt 0 0    
Collateral finance and securitization notes   0    
Fair Value, Inputs, Level 2 [Member]        
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Funds Held under Reinsurance Agreements, Liability 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 1,231 1,234    
Funds withheld at interest 0 0    
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures 0 0    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 65 70    
Accrued investment income 630 533    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 0 0    
Funds Held under Reinsurance Agreements, Liability 0 0    
Long And Short Term Debt 0 0    
Collateral finance and securitization notes   0    
Fair Value, Inputs, Level 3 [Member]        
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Funds Held under Reinsurance Agreements, Liability 361 61    
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 6,109 6,580    
Policy loans 0 0    
Funds withheld at interest 5,884 7,075    
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures 52 81    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 689 750    
Accrued investment income 0 0    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 23,065 19,540    
Funds Held under Reinsurance Agreements, Liability 1,321 1,657    
Long And Short Term Debt $ 3,670 3,886    
Collateral finance and securitization notes   $ 153    
[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.