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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value $ 77,853   $ 78,939      
Equity securities, at fair value 843   937      
Other Investments 5,425   4,672      
Securities lending collateral 2,143   1,737      
U.S. Treasury and agency            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 4,049   3,698      
Foreign            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 21,355   21,030      
Corporate securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 24,795   23,996      
Mortgage-backed securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 15,898   15,290      
States, municipalities, and political subdivisions            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 11,756   14,925      
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Other Investments 4,368   3,623      
Other Investments [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Other Investments 61   15      
Fair Value, Measurements, Recurring [Member] | Level 1            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 3,272   3,129      
Equity securities, at fair value 790   893      
Short-term investments 1,832   2,309      
Other Investments 395 [1]   466 [2]      
Securities lending collateral     0      
Investment derivative instruments, assets 29   18      
Other Derivative Instruments Fair Value 5   1      
Separate Account Assets 2,880   2,635      
Total assets measured at fair value 9,203 [1]   9,451 [2]      
Investment derivative instruments, liabilities 24   30      
Other derivative instruments, liability 7   21      
Liabilities Related to Investment Contracts, Fair Value Disclosure 31   51      
Fair Value, Measurements, 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 3,272   3,129      
Fair Value, Measurements, Recurring [Member] | Level 2            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 73,019   74,602      
Equity securities, at fair value     0      
Short-term investments 1,641   1,252      
Other Investments 338 [1]   305 [2]      
Securities lending collateral 2,143   1,737      
Investment derivative instruments, assets 26          
Separate Account Assets 113   99      
Total assets measured at fair value 77,280 [1]   77,995 [2]      
Fair Value, Measurements, 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 777   569      
Fair Value, Measurements, Recurring [Member] | Level 2 | Foreign            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 21,032   20,937      
Fair Value, Measurements, Recurring [Member] | Level 2 | Corporate securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 23,621   22,959      
Fair Value, Measurements, Recurring [Member] | Level 2 | Mortgage-backed securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 15,833   15,212      
Fair Value, Measurements, 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 11,756   14,925      
Fair Value, Measurements, Recurring [Member] | Level 3            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 1,562   1,208      
Equity securities, at fair value 53   44      
Short-term investments 6          
Other Investments 263 [1]   263 [2]      
Total assets measured at fair value 1,884 [1]   1,515 [2]      
Other derivative instruments, liability 2   2      
Liabilities Related to Investment Contracts, Fair Value Disclosure 73   206      
Fair Value, Measurements, Recurring [Member] | Level 3 | Foreign            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 323   93      
Fair Value, Measurements, Recurring [Member] | Level 3 | Corporate securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 1,174   1,037      
Fair Value, Measurements, Recurring [Member] | Level 3 | Mortgage-backed securities            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 65   78      
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]            
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]            
Available for sale, Fair Value 77,853   78,939      
Equity securities, at fair value 843   937      
Short-term investments 3,479   3,561      
Other Investments 996 [1]   1,034 [2]      
Securities lending collateral 2,143   1,737      
Investment derivative instruments, assets 55   18      
Other Derivative Instruments Fair Value 5   1      
Separate Account Assets 2,993   2,734      
Total assets measured at fair value 88,367 [1]   88,961 [2]      
Investment derivative instruments, liabilities 24   30      
Other derivative instruments, liability 9   23      
Liabilities Related to Investment Contracts, Fair Value Disclosure 104   257      
Fair Value, Measurements, 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 4,049   3,698      
Fair Value, Measurements, 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 21,355   21,030      
Fair Value, Measurements, 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 24,795   23,996      
Fair Value, Measurements, 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 15,898   15,290      
Fair Value, Measurements, 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 11,756   14,925      
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 71 $ 125 204 $ 303 $ 357 $ 559
Guaranteed Minimum Income Benefit [Member] | Fair Value, Measurements, 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] 71   204      
Guaranteed Minimum Income Benefit [Member] | Fair Value, Measurements, 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] $ 71   $ 204      
[1] (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $4,368 million and other investments of $61 million at September 30, 2018 measured using NAV as a practical expedient.
[2] (1) Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,623 million and other investments of $15 million at December 31, 2017 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.