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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value $ 89,852   $ 85,488      
Equity securities, at fair value 3,088   812      
Short-term investments 4,660   4,291      
Other Investments 6,796   6,062      
Securities lending collateral 1,851   994      
U.S. Treasury / Agency            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 2,791   3,283      
Non-U.S.            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 25,282   23,707      
Corporate and asset-backed securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 35,298   31,791      
Mortgage-backed securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 19,337   19,192      
Municipal            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 7,144   7,515      
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Other Investments 5,694   4,921      
Other Investments [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Other Investments 90   95      
Policy Loans [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Other Investments 225          
Fair Value, Recurring [Member] | Level 1            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 2,264   2,664      
Equity securities, at fair value 3,022   728      
Short-term investments 3,270   2,803      
Other Investments 374 [1]   412 [2]      
Securities lending collateral 0   0      
Investment derivative instruments, assets 24   24      
Other Derivative Instruments Fair Value 3   2      
Separate Account Asset 3,535   3,437      
Total assets measured at fair value 12,492 [1]   10,070 [2]      
Investment derivative instruments, liabilities 77   93      
Other derivative instruments, liability     13      
Liabilities Related to Investment Contracts, Fair Value Disclosure 77   106      
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 2,264   2,664      
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 2            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 85,588   80,864      
Equity securities, at fair value 0   15      
Short-term investments 1,383   1,482      
Other Investments 403 [1]   377 [2]      
Securities lending collateral 1,851   994      
Investment derivative instruments, assets 0   0      
Other Derivative Instruments Fair Value 0   0      
Separate Account Asset 123   136      
Total assets measured at fair value 89,348 [1]   83,868 [2]      
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 527   619      
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 24,788   23,258      
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 33,853   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 19,276   19,132      
Fair Value, Recurring [Member] | Level 2 | Municipal            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 7,144   7,515      
Fair Value, Recurring [Member] | Level 3            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 2,000   1,960      
Equity securities, at fair value 66   69      
Short-term investments 7   6      
Other Investments 10 [1]   10 [2]      
Securities lending collateral 0   0      
Investment derivative instruments, assets 0   0      
Other Derivative Instruments Fair Value 0   0      
Separate Account Asset 0   0      
Total assets measured at fair value 2,083 [1]   2,045 [2]      
Investment derivative instruments, liabilities 0   0      
Other derivative instruments, liability     0      
Liabilities Related to Investment Contracts, Fair Value Disclosure 882   456      
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 494   449      
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 1,445   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 61   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] | Estimate of Fair Value Measurement [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 89,852   85,488      
Equity securities, at fair value 3,088   812      
Short-term investments 4,660   4,291      
Other Investments 787 [1]   799 [2]      
Securities lending collateral 1,851   994      
Investment derivative instruments, assets 24   24      
Other Derivative Instruments Fair Value 3   2      
Separate Account Asset 3,658   3,573      
Total assets measured at fair value 103,923 [1]   95,983 [2]      
Investment derivative instruments, liabilities 77   93      
Other derivative instruments, liability     13      
Liabilities Related to Investment Contracts, Fair Value Disclosure 959   562      
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 2,791   3,283      
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 25,282   23,707      
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 35,298   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 19,337   19,192      
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 7,144   7,515      
Guaranteed Minimum Income Benefit [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 882 $ 928 456 $ 509 $ 403 $ 452
Guaranteed Minimum Income Benefit [Member] | Fair Value, Recurring [Member] | Level 1            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 0 [3]   0 [4]      
Guaranteed Minimum Income Benefit [Member] | Fair Value, Recurring [Member] | Level 2            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 0 [3]   0 [4]      
Guaranteed Minimum Income Benefit [Member] | Fair Value, Recurring [Member] | Level 3            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value [5] 882 [3]   456 [4]      
Guaranteed Minimum Income Benefit [Member] | Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 882 [3]   $ 456 [4]      
[1] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $5,694 million, policy loans of $225 million and other investments of $90 million at September 30, 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.
[3] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.
[4] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.
[5] The weighted average lapse and annuitization rates are determined by weighting each treaty's rates by the GLB contracts fair value.