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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 90,699 $ 85,488
Equity Securities, FV-NI 4,027 812
Short-term investments 4,345 4,291
Other Investments 7,945 6,062
Securities lending collateral 1,844 994
US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,670 3,283
Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 26,354 23,707
Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 36,331 31,791
Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 18,470 19,192
States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 6,874 7,515
Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 7,945 6,062
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 6,770 4,921
Other Investments    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 60 95
Policy Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 233  
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 90,699 85,488
Equity Securities   812
Equity Securities, FV-NI 4,027  
Short-term investments 4,345 4,291
Other Investments 882 799
Securities lending collateral 1,844 994
Investment derivative instruments, assets 35 24
Other derivative instruments, assets   2
Separate Account Asset 4,388 3,573
Total assets measured at fair value 106,220 [1] 95,983 [2]
Investment derivative instruments, liability 52 93
Liabilities Related to Investment Contracts, Fair Value Disclosure 1,158 1,003
Other derivative instruments, liability 17 13
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,670 3,283
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 26,354 23,707
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 36,331 31,791
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 18,470 19,192
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 6,874 7,515
Fair Value, Recurring [Member] | Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,148 2,664
Equity Securities   728
Equity Securities, FV-NI 3,954  
Short-term investments 2,866 2,803
Other Investments 434 412
Securities lending collateral 0 0
Investment derivative instruments, assets 35 24
Other derivative instruments, assets   2
Separate Account Asset 4,264 3,437
Total assets measured at fair value 13,701 [1] 10,070 [2]
Investment derivative instruments, liability 52 93
Liabilities Related to Investment Contracts, Fair Value Disclosure 69 106
Other derivative instruments, liability 17 13
Fair Value, Recurring [Member] | Level 1 | US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,148 2,664
Fair Value, Recurring [Member] | Level 1 | Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 1 | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 1 | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 1 | States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 2    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 86,372 80,864
Equity Securities   15
Equity Securities, FV-NI 0  
Short-term investments 1,474 1,482
Other Investments 438 377
Securities lending collateral 1,844 994
Investment derivative instruments, assets 0 0
Other derivative instruments, assets   0
Separate Account Asset 124 136
Total assets measured at fair value 90,252 [1] 83,868 [2]
Investment derivative instruments, liability 0 0
Liabilities Related to Investment Contracts, Fair Value Disclosure 0 0
Other derivative instruments, liability 0 0
Fair Value, Recurring [Member] | Level 2 | US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 522 619
Fair Value, Recurring [Member] | Level 2 | Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,808 23,258
Fair Value, Recurring [Member] | Level 2 | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 34,758 30,340
Fair Value, Recurring [Member] | Level 2 | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 18,410 19,132
Fair Value, Recurring [Member] | Level 2 | States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 6,874 7,515
Fair Value, Recurring [Member] | Level 3    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,179 1,960
Equity Securities   69
Equity Securities, FV-NI 73  
Short-term investments 5 6
Other Investments 10 10
Securities lending collateral 0 0
Investment derivative instruments, assets 0 0
Other derivative instruments, assets   0
Separate Account Asset 0 0
Total assets measured at fair value 2,267 [1] 2,045 [2]
Investment derivative instruments, liability 0 0
Liabilities Related to Investment Contracts, Fair Value Disclosure 1,089 897
Other derivative instruments, liability 0 0
Fair Value, Recurring [Member] | Level 3 | US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 3 | Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 546 449
Fair Value, Recurring [Member] | Level 3 | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,573 1,451
Fair Value, Recurring [Member] | Level 3 | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 60 60
Fair Value, Recurring [Member] | Level 3 | States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 1,089 897
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 0 0
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Level 2    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 0 0
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Level 3    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross $ 1,089 $ 897
[1] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $6,770 million, policy loans of $233 million and other investments of $60 million at December 31, 2020 measured using NAV as a practical expedient
[2] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $4,921 million and other investments of $95 million at December 31, 2019 measured using NAV as a practical expedient.(2)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.