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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Reported Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) [1] $ 6,001 $ 5,787    
Policy loans [1] 1,253 1,258    
Funds withheld at interest [1] 5,264 5,292    
Cash and cash equivalents [1] 1,662 1,930    
Short-term investments [1] 34 30    
Other invested assets [1] 1,139 1,482    
Accrued investment income [1] 546 511    
Liabilities        
Interest-sensitive contract liabilities [1] 18,031 18,106    
Long-term debt [1] 3,573 3,573    
Collateral finance and securitization notes [1] 346 388    
Estimate of Fair Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 6,231 6,167    
Policy loans 1,253 1,258    
Funds withheld at interest 5,618 5,676    
Cash and cash equivalents 1,662 1,930    
Short-term investments 34 30    
Other invested assets 1,115 1,601    
Accrued investment income 546 511    
Liabilities        
Interest-sensitive contract liabilities 19,470 19,683    
Long-term Debt, Fair Value 3,800 3,901    
Collateral finance and securitization notes 311 351    
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 1 Member        
Assets        
Mortgage loans on real estate (net of valuation allowances) 0 0    
Policy loans 0 0    
Funds withheld at interest 0 0    
Cash and cash equivalents 1,662 1,930    
Short-term investments 34 30    
Other invested assets 6 5    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities 0 0    
Long-term Debt, Fair Value 0 0    
Collateral finance and securitization notes 0 0    
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 2 Member        
Assets        
Mortgage loans on real estate (net of valuation allowances) 0 0    
Policy loans 1,253 1,258    
Funds withheld at interest 0 0    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 86 89    
Accrued investment income 546 511    
Liabilities        
Interest-sensitive contract liabilities 0 0    
Long-term Debt, Fair Value 0 0    
Collateral finance and securitization notes 0 0    
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 3 Member        
Assets        
Mortgage loans on real estate (net of valuation allowances) 6,231 6,167    
Policy loans 0 0    
Funds withheld at interest 5,618 5,676    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 1,023 1,018    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities 19,470 19,683    
Long-term Debt, Fair Value 3,800 3,901    
Collateral finance and securitization notes 311 351    
Estimate of Fair Value Measurement [Member] | Fair Value Measured at Net Asset Value Per Share        
Assets        
Mortgage loans on real estate (net of valuation allowances) 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 0 489    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities 0 0    
Long-term Debt, Fair Value 0 0    
Collateral finance and securitization notes 0 0    
Mortgage loans on real estate (net of valuation allowances) 6,001 5,787    
Policy loans 1,253 1,258    
Funds withheld at interest 5,459 5,432    
Cash and cash equivalents 3,122 3,408 $ 2,820 $ 1,449
Short-term investments 157 227    
Other invested assets 2,983 2,829    
Accrued investment income 546 511    
Interest-sensitive contract liabilities 23,142 23,276    
Long-term debt $ 3,573 $ 3,573    
[1] Carrying values presented herein may differ from those in the Company’s condensed consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.