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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value $ 10,670 $ 8,552
Fixed maturities held to maturity, at amortized cost (fair value – $10,670 and $8,552) 10,644 8,430
Repurchase agreements 1,403 1,404
Short-term debt 500 0
Long-term debt 12,610 9,389
Trust preferred securities 308 307
Total liabilities 111,511 73,171
US Treasury and Government [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 661 745
Foreign    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 667 785
Corporate Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 2,795 3,056
Mortgage backed-securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 1,428 1,743
US States and Political Subdivisions Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 5,119 2,223
Reported Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $10,670 and $8,552) 10,644 8,430
Repurchase agreements 1,403 1,404
Short-term debt 500  
Long-term debt 12,610 9,389
Trust preferred securities 308 307
Total liabilities 14,821 11,100
Reported Value Measurement | US Treasury and Government [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $10,670 and $8,552) 655 733
Reported Value Measurement | Foreign    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $10,670 and $8,552) 640 763
Reported Value Measurement | Corporate Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $10,670 and $8,552) 2,771 3,054
Reported Value Measurement | Mortgage backed-securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $10,670 and $8,552) 1,393 1,707
Reported Value Measurement | US States and Political Subdivisions Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturities held to maturity, at amortized cost (fair value – $10,670 and $8,552) 5,185 2,173
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Repurchase agreements 1,403 1,404
Short-term debt, Fair Value 503  
Long-term debt, Fair Value 12,998 9,678
Trust preferred securities 456 446
Total liabilities 15,360 11,528
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 555 583
Repurchase agreements 0 0
Short-term debt, Fair Value 0  
Long-term debt, Fair Value 0 0
Trust preferred securities 0 0
Total liabilities 0 0
Level 1 | US Treasury and Government [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 555 583
Level 1 | Foreign    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 0 0
Level 1 | Corporate Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 0 0
Level 1 | Mortgage backed-securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 0 0
Level 1 | US States and Political Subdivisions Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 10,102 7,955
Repurchase agreements 1,403 1,404
Short-term debt, Fair Value 503  
Long-term debt, Fair Value 12,998 9,678
Trust preferred securities 456 446
Total liabilities 15,360 11,528
Level 2 | US Treasury and Government [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 106 162
Level 2 | Foreign    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 667 785
Level 2 | Corporate Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 2,782 3,042
Level 2 | Mortgage backed-securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 1,428 1,743
Level 2 | US States and Political Subdivisions Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 5,119 2,223
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 13 14
Repurchase agreements 0 0
Short-term debt, Fair Value 0  
Long-term debt, Fair Value 0 0
Trust preferred securities 0 0
Total liabilities 0 0
Level 3 | US Treasury and Government [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 0 0
Level 3 | Corporate Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 13 14
Level 3 | Mortgage backed-securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value 0 0
Level 3 | US States and Political Subdivisions Debt Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity Securities, Fair Value $ 0 $ 0