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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 93,108 $ 90,699
Equity Securities, FV-NI 4,782 4,027
Short-term investments 3,146 4,345
Other Investments 11,169 7,945
Securities lending collateral 1,831 1,844
US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,214 2,670
Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,829 26,354
Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 39,063 36,331
Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 20,489 18,470
States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 5,513 6,874
Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 11,169 7,945
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 10,108 6,770
Other Investments    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 51 60
Policy Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 243 233
Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 93,108 90,699
Equity Securities, FV-NI 4,782 4,027
Short-term investments 3,146 4,345
Other Investments 767 882
Securities lending collateral 1,831 1,844
Investment derivative instruments, assets 58 35
Separate Account Asset 5,560 4,388
Total assets measured at fair value 109,252 106,220 [1]
Investment derivative instruments, liability 166 52
Other derivative instruments, liability 16 17
Liabilities Related to Investment Contracts, Fair Value Disclosure 927 1,158
Fair Value, Recurring [Member] | US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,214 2,670
Fair Value, Recurring [Member] | Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,829 26,354
Fair Value, Recurring [Member] | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 39,063 36,331
Fair Value, Recurring [Member] | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 20,489 18,470
Fair Value, Recurring [Member] | States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 5,513 6,874
Fair Value, Recurring [Member] | Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,680 2,148
Equity Securities, FV-NI 4,705 3,954
Short-term investments 1,744 2,866
Other Investments 286 434
Securities lending collateral 0 0
Investment derivative instruments, assets 58 35
Separate Account Asset 5,461 4,264
Total assets measured at fair value 13,934 [2] 13,701 [1]
Investment derivative instruments, liability 166 52
Other derivative instruments, liability 16 17
Liabilities Related to Investment Contracts, Fair Value Disclosure 182 69
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 1,680 2,148
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 88,720 86,372
Equity Securities, FV-NI 0 0
Short-term investments 1,395 1,474
Other Investments 481 438
Securities lending collateral 1,831 1,844
Investment derivative instruments, assets 0 0
Separate Account Asset 99 124
Total assets measured at fair value 92,526 [2] 90,252 [1]
Investment derivative instruments, liability 0 0
Other derivative instruments, liability 0 0
Liabilities Related to Investment Contracts, Fair Value Disclosure 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 534 522
Fair Value, Recurring [Member] | Level 2 | Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,196 25,808
Fair Value, Recurring [Member] | Level 2 | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 37,014 34,758
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 20,463 18,410
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 5,513 6,874
Fair Value, Recurring [Member] | Level 3    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,708 2,179
Equity Securities, FV-NI 77 73
Short-term investments 7 5
Other Investments 0 10
Securities lending collateral 0 0
Investment derivative instruments, assets 0 0
Separate Account Asset 0 0
Total assets measured at fair value 2,792 2,267 [1]
Investment derivative instruments, liability 0 0
Other derivative instruments, liability 0 0
Liabilities Related to Investment Contracts, Fair Value Disclosure 745 1,089
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 633 546
Fair Value, Recurring [Member] | Level 3 | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,049 1,573
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 26 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]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 745 1,089
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 $ 745 $ 1,089
[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)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[2] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $10,108 million, policy loans of $243 million and other investments of $51 million at December 31, 2021 measured using NAV as a practical expedient