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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value $ 81,358 $ 43,587      
Equity securities, at fair value 803 497      
Other investments (cost – $4,170 and $2,993) 4,400 3,291      
Securities lending collateral 1,140 1,046      
Other Other investment [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Other investments (cost – $4,170 and $2,993) 25 25      
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Other investments (cost – $4,170 and $2,993) 3,498 2,477      
Fair Value, Measurements, Recurring [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 81,358 43,587      
Equity securities, at fair value 803 497      
Short-term investments 3,548 10,446      
Other investments (cost – $4,170 and $2,993) 877 789      
Securities lending collateral 1,140 1,046      
Investment derivative instruments, assets 20 12      
Other Derivative Instruments Fair Value 14        
Separate Account Assets 1,840 1,552      
Total assets measured at fair value 89,600 57,929      
Investment derivative instruments, liabilities 34 13      
Other derivative instruments, liability 8 10      
GLB (2) 883 609      
Total liabilities measured at fair value 925 632      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 755 284      
Equity securities, at fair value 37 16      
Short-term investments 62        
Other investments (cost – $4,170 and $2,993) 223 212      
Other Derivative Instruments Fair Value 0        
Total assets measured at fair value 1,077 512      
Other derivative instruments, liability 8 6      
GLB (2) 883 609      
Total liabilities measured at fair value 891 615      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 2,155 1,712      
Equity securities, at fair value 766 481      
Short-term investments 2,127 7,171      
Other investments (cost – $4,170 and $2,993) 404 347      
Investment derivative instruments, assets 20 12      
Other Derivative Instruments Fair Value 14        
Separate Account Assets 1,743 1,464      
Total assets measured at fair value 7,229 11,187      
Investment derivative instruments, liabilities 34 13      
Other derivative instruments, liability   4      
Total liabilities measured at fair value 34 17      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 78,448 41,591      
Short-term investments 1,359 3,275      
Other investments (cost – $4,170 and $2,993) 250 230      
Securities lending collateral 1,140 1,046      
Other Derivative Instruments Fair Value 0        
Separate Account Assets 97 88      
Total assets measured at fair value 81,294 46,230      
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 2,708 2,528      
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 2,155 1,712      
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 553 816      
Fair Value, Measurements, Recurring [Member] | Foreign [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 22,508 13,445      
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 103 57      
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 22,405 13,388      
Fair Value, Measurements, Recurring [Member] | Corporate [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 23,773 14,929      
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 606 174      
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 23,167 14,755      
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 13,461 9,958      
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 46 53      
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 13,415 9,905      
Fair Value, Measurements, Recurring [Member] | States, Municipalities, And Political Subdivisions [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 18,908 2,727      
Fair Value, Measurements, Recurring [Member] | States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Available for sale, Fair Value 18,908 2,727      
Guaranteed Minimum Income Benefit [Member]          
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]          
Guaranteed Benefit Liability, Net $ 1,200 $ 888 $ 1,000 $ 615 $ 663