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Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Assets        
Mortgage loans on real estate (net of valuation allowances) $ 6,366 $ 5,787    
Policy loans 1,234 1,258    
Funds withheld at interest 7,034 5,432    
Cash and cash equivalents 3,027 3,408 $ 3,256 $ 1,449
Short-term investments 82 227    
Other invested assets 3,404 2,829    
Accrued investment income 574 511    
Liabilities        
Interest-sensitive contract liabilities 26,017 23,276    
Other liabilities 3,327 1,340    
Long-term debt 3,173 3,573    
Reported Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) [1] 6,366 5,787    
Policy loans [1] 1,234 1,258    
Funds withheld at interest [1] 6,744 5,292    
Cash and cash equivalents [1] 1,721 1,930    
Short-term investments [1] 18 30    
Other invested assets [1] 1,315 1,482    
Accrued investment income [1] 574 511    
Liabilities        
Interest-sensitive contract liabilities [1] 19,580 18,106    
Other liabilities [1] 1,588      
Long-term debt [1] 3,173      
Debt, Long-term and Short-term, Combined Amount [1]   3,573    
Collateral finance and securitization notes [1] 314 388    
Estimate of Fair Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 6,656 6,167    
Policy loans 1,234 1,258    
Funds withheld at interest 7,210 5,676    
Cash and cash equivalents 1,721 1,930    
Short-term investments 18 30    
Other invested assets 1,307 1,601    
Accrued investment income 574 511    
Liabilities        
Interest-sensitive contract liabilities 20,940 19,683    
Other liabilities 1,683      
Long-term Debt, Fair Value 3,412      
Debt, Long-term and Short-term, Combined Amount   3,901    
Collateral finance and securitization notes 284 351    
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 1,721 1,930    
Short-term investments 18 30    
Other invested assets 6 5    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities 0 0    
Other liabilities 0      
Long-term Debt, Fair Value 0      
Debt, Long-term and Short-term, Combined Amount   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 1,234 1,258    
Funds withheld at interest 1,690 0    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 77 89    
Accrued investment income 574 511    
Liabilities        
Interest-sensitive contract liabilities 0 0    
Other liabilities 1,683      
Long-term Debt, Fair Value 0      
Debt, Long-term and Short-term, Combined Amount   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) 6,656 6,167    
Policy loans 0 0    
Funds withheld at interest 5,520 5,676    
Cash and cash equivalents 0 0    
Short-term investments 0 0    
Other invested assets 1,224 1,018    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities 20,940 19,683    
Other liabilities 0      
Long-term Debt, Fair Value 3,412      
Debt, Long-term and Short-term, Combined Amount   3,901    
Collateral finance and securitization notes 284 351    
Estimate of Fair Value Measurement [Member] | Fair Value Measured at Net Asset Value Per Share [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 0 0    
Short-term investments 0 0    
Other invested assets 0 489    
Accrued investment income 0 0    
Liabilities        
Interest-sensitive contract liabilities 0 0    
Other liabilities 0      
Long-term Debt, Fair Value 0      
Debt, Long-term and Short-term, Combined Amount   0    
Collateral finance and securitization notes $ 0 $ 0    
[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.