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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value $ 85,044   $ 78,470      
Equity securities, at fair value and cost 722   770      
Other Investments 5,955   5,277      
Securities lending collateral 962   1,926      
U.S. Treasury and agency            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 3,570   4,145      
Foreign            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 23,077   21,416      
Corporate securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 31,367   26,583      
Mortgage-backed securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 19,014   15,540      
States, municipalities, and political subdivisions            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 8,016   10,786      
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Other Investments 4,871   4,244      
Other Investments [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Other Investments 88   95      
Fair Value, Recurring [Member] | Level 1            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 2,893   3,400      
Equity securities, at fair value and cost 662   713      
Short-term investments 1,483   1,575      
Other Investments 392 [1]   381 [2]      
Securities lending collateral 0   0      
Investment derivative instruments, assets 22   28      
Other Derivative Instruments Fair Value 7   25      
Separate Account Asset 3,140   2,686      
Total assets measured at fair value 8,599 [1]   8,808 [2]      
Investment derivative instruments, liabilities 63   38      
Liabilities Related to Investment Contracts, Fair Value Disclosure 63   38      
Fair Value, Recurring [Member] | Level 1 | U.S. Treasury and agency            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 2,893   3,400      
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 80,231   73,365      
Equity securities, at fair value and cost 4   0      
Short-term investments 1,346   1,440      
Other Investments 353 [1]   303 [2]      
Securities lending collateral 962   1,926      
Investment derivative instruments, assets 0   0      
Other Derivative Instruments Fair Value 0   0      
Separate Account Asset 147   137      
Total assets measured at fair value 83,043 [1]   77,171 [2]      
Investment derivative instruments, liabilities 0   115      
Liabilities Related to Investment Contracts, Fair Value Disclosure 0   115      
Fair Value, Recurring [Member] | Level 2 | U.S. Treasury and agency            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 677   745      
Fair Value, Recurring [Member] | Level 2 | Foreign            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 22,684   21,071      
Fair Value, Recurring [Member] | Level 2 | Corporate securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 29,917   25,284      
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 18,937   15,479      
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 8,016   10,786      
Fair Value, Recurring [Member] | Level 3            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 1,920   1,705      
Equity securities, at fair value and cost 56   57      
Short-term investments 6   1      
Other Investments 10 [1]   11 [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 1,992 [1]   1,774 [2]      
Investment derivative instruments, liabilities 0   0      
Liabilities Related to Investment Contracts, Fair Value Disclosure 509   452      
Fair Value, Recurring [Member] | Level 3 | U.S. Treasury and 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 | Foreign            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 393   345      
Fair Value, Recurring [Member] | Level 3 | Corporate securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 1,450   1,299      
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 77   61      
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      
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 85,044   78,470      
Equity securities, at fair value and cost 722   770      
Short-term investments 2,835   3,016      
Other Investments 755 [1]   695 [2]      
Securities lending collateral 962   1,926      
Investment derivative instruments, assets 22   28      
Other Derivative Instruments Fair Value 7   25      
Separate Account Asset 3,287   2,823      
Total assets measured at fair value 93,634 [1]   87,753 [2]      
Investment derivative instruments, liabilities 63   153      
Liabilities Related to Investment Contracts, Fair Value Disclosure 572   605      
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | U.S. Treasury and agency            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 3,570   4,145      
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 23,077   21,416      
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 31,367   26,583      
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 19,014   15,540      
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 8,016   10,786      
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 509 $ 403 452 $ 71 $ 125 $ 204
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 [3] 0   0      
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 [3] 0   0      
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 [3] 509   452      
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 [3] $ 509   $ 452      
[1]
Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $4,871 million and other investments of $88 million at September 30, 2019 measured using NAV as a practical expedient.
[2]
Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $4,244 million and other investments of $95 million at December 31, 2018 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.