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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Document Period End Date Sep. 30, 2015  
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) $ 8,564 $ 7,331
Investments in partially-owned insurance companies 654 504
Total assets 97,760 98,248
Short-term debt 2,103 2,552
Long-term debt 4,157 3,357
Trust preferred securities 309 309
Total liabilities 68,633 68,661
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 8,750 7,589
Short-term debt 2,105 2,571
Long-term debt 4,376 3,690
Trust preferred securities 457 462
Total liabilities 6,938 6,723
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 8,564 7,331
Short-term debt 2,103 2,552
Long-term debt 4,157 3,357
Trust preferred securities 309 309
Total liabilities 6,569 6,218
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 599 659
Short-term debt 0 0
Long-term debt 0 0
Trust preferred securities 0 0
Total liabilities 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 8,137 6,915
Short-term debt 2,105 2,571
Long-term debt 4,376 3,690
Trust preferred securities 457 462
Total liabilities 6,938 6,723
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 14 15
Short-term debt 0 0
Long-term debt 0 0
Trust preferred securities 0 0
Total liabilities 0 0
U.S. Treasury And Agency [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 774 850
U.S. Treasury And Agency [Member] | Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 756 832
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 599 659
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 175 191
U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 0 0
Foreign [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 818 963
Foreign [Member] | Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 784 916
Foreign [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 0 0
Foreign [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 818 963
Foreign [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 0 0
Corporate Debt Securities [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 3,126 2,423
Corporate Debt Securities [Member] | Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 3,093 2,323
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 0 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 3,112 2,408
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 14 15
Collateralized Mortgage Backed Securities [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 1,817 2,039
Collateralized Mortgage Backed Securities [Member] | Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 1,758 1,983
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 0 0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 1,817 2,039
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 0 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 2,215 1,314
US States and Political Subdivisions Debt Securities [Member] | Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 2,173 1,277
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 0 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) 2,215 1,314
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $8,750 and $7,589) $ 0 $ 0