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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 92,685 $ 90,699
Equity securities, at fair value 4,557 4,027
Short-term investments 3,529 4,345
Other investments, at fair value 10,843 7,945
Securities lending collateral 2,368 1,844
U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,287 2,670
Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,927 26,354
Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 38,716 36,331
Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 19,963 18,470
Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 5,792 6,874
Fair Value, Recurring [Member] | Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,786 2,148
Equity securities, at fair value 4,478 3,954
Short-term investments 2,012 2,866
Other investments, at fair value 292 434 [1]
Securities lending collateral 0 0
Investment derivative instruments, assets 97 35
Other Derivative Instruments Fair Value 35  
Separate Account Asset 5,225 4,264
Total assets measured at fair value 13,925 [2] 13,701 [1]
Investment derivative instruments, liabilities 111 52
Other derivative instruments, liability   17
Liabilities Related to Investment Contracts, Fair Value Disclosure 111 69
Fair Value, Recurring [Member] | Level 1 | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,786 2,148
Fair Value, Recurring [Member] | Level 1 | Non-U.S.    
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 and asset-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 | 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 | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 1 | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 0 0 [3]
Fair Value, Recurring [Member] | Level 2    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 88,327 86,372
Equity securities, at fair value 0 0
Short-term investments 1,507 1,474
Other investments, at fair value 468 438 [1]
Securities lending collateral 2,368 1,844
Investment derivative instruments, assets 0 0
Other Derivative Instruments Fair Value 0  
Separate Account Asset 105 124
Total assets measured at fair value 92,775 [2] 90,252 [1]
Investment derivative instruments, liabilities 0 0
Other derivative instruments, liability   0
Liabilities Related to Investment Contracts, Fair Value Disclosure 0 0
Fair Value, Recurring [Member] | Level 2 | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 501 522
Fair Value, Recurring [Member] | Level 2 | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,267 25,808
Fair Value, Recurring [Member] | Level 2 | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 36,857 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 19,910 18,410
Fair Value, Recurring [Member] | Level 2 | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 5,792 6,874
Fair Value, Recurring [Member] | Level 2 | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 0 0 [3]
Fair Value, Recurring [Member] | Level 3    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,572 2,179
Equity securities, at fair value 79 73
Short-term investments 10 5
Other investments, at fair value 0 10 [1]
Securities lending collateral 0 0
Investment derivative instruments, assets 0 0
Other Derivative Instruments Fair Value 0  
Separate Account Asset 0 0
Total assets measured at fair value 2,661 [2] 2,267 [1]
Investment derivative instruments, liabilities 0 0
Other derivative instruments, liability   0
Liabilities Related to Investment Contracts, Fair Value Disclosure 818 1,089
Fair Value, Recurring [Member] | Level 3 | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 3 | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 660 546
Fair Value, Recurring [Member] | Level 3 | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,859 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 53 60
Fair Value, Recurring [Member] | Level 3 | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 3 | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 818 1,089 [3]
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 92,685 90,699
Equity securities, at fair value 4,557 4,027
Short-term investments 3,529 4,345
Other investments, at fair value 760 882 [1]
Securities lending collateral 2,368 1,844
Investment derivative instruments, assets 97 35
Other Derivative Instruments Fair Value 35  
Separate Account Asset 5,330 4,388
Total assets measured at fair value 109,361 [2] 106,220 [1]
Investment derivative instruments, liabilities 111 52
Other derivative instruments, liability   17
Liabilities Related to Investment Contracts, Fair Value Disclosure 929 1,158
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,287 2,670
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,927 26,354
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 38,716 36,331
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 19,963 18,470
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 5,792 6,874
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 818 1,089 [3]
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value 9,768 6,770
Policy Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value 235 233
Other Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value $ 80 $ 60
[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 $9,768 million, policy loans of $235 million and other investments of $80 million at September 30, 2021 measured using NAV as a practical expedient.
[3] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.