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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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Financial Instruments Fair Value [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | $ 7,763 | $ 6,263 |
| Partially-owned insurance companies | 495 | 470 |
| Total assets | 8,258 | 6,733 |
| Short-term debt | 1,864 | 1,913 |
| Long-term debt | 4,349 | 4,088 |
| Trust preferred securities | 459 | 438 |
| Total liabilities | 6,672 | 6,439 |
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Financial Instruments Fair Value [Member] | U.S. Treasury And Agency [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 817 | 832 |
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Financial Instruments Fair Value [Member] | Foreign [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 978 | 897 |
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Financial Instruments Fair Value [Member] | Corporate Debt Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 2,525 | 2,005 |
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Financial Instruments Fair Value [Member] | Collateralized Mortgage Backed Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 2,130 | 1,379 |
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Financial Instruments Fair Value [Member] | US States and Political Subdivisions Debt Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 1,313 | 1,150 |
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Fair Value, Inputs, Level 1 [Member] | Financial Instruments Fair Value [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 625 | 596 |
| Total assets | 625 | 596 |
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Fair Value, Inputs, Level 1 [Member] | Financial Instruments Fair Value [Member] | U.S. Treasury And Agency [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 625 | 596 |
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Fair Value, Inputs, Level 2 [Member] | Financial Instruments Fair Value [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 7,123 | 5,652 |
| Total assets | 7,123 | 5,652 |
| Short-term debt | 1,864 | 1,913 |
| Long-term debt | 4,349 | 4,088 |
| Trust preferred securities | 459 | 438 |
| Total liabilities | 6,672 | 6,439 |
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Fair Value, Inputs, Level 2 [Member] | Financial Instruments Fair Value [Member] | U.S. Treasury And Agency [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 192 | 236 |
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Fair Value, Inputs, Level 2 [Member] | Financial Instruments Fair Value [Member] | Foreign [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 978 | 897 |
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Fair Value, Inputs, Level 2 [Member] | Financial Instruments Fair Value [Member] | Corporate Debt Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 2,510 | 1,990 |
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Fair Value, Inputs, Level 2 [Member] | Financial Instruments Fair Value [Member] | Collateralized Mortgage Backed Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 2,130 | 1,379 |
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Fair Value, Inputs, Level 2 [Member] | Financial Instruments Fair Value [Member] | US States and Political Subdivisions Debt Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 1,313 | 1,150 |
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Fair Value, Inputs, Level 3 [Member] | Financial Instruments Fair Value [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 15 | 15 |
| Partially-owned insurance companies | 495 | 470 |
| Total assets | 510 | 485 |
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Fair Value, Inputs, Level 3 [Member] | Financial Instruments Fair Value [Member] | U.S. Treasury And Agency [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 0 | 0 |
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Fair Value, Inputs, Level 3 [Member] | Financial Instruments Fair Value [Member] | Corporate Debt Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 15 | 15 |
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Carrying (Reported) Amount, Fair Value Disclosure [Member] | Financial Instruments Carrying Value [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 7,548 | 6,098 |
| Partially-owned insurance companies | 495 | 470 |
| Total assets | 8,043 | 6,568 |
| Short-term debt | 1,851 | 1,901 |
| Long-term debt | 4,057 | 3,807 |
| Trust preferred securities | 309 | 309 |
| Total liabilities | 6,217 | 6,017 |
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Carrying (Reported) Amount, Fair Value Disclosure [Member] | Financial Instruments Carrying Value [Member] | U.S. Treasury And Agency [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 804 | 820 |
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Carrying (Reported) Amount, Fair Value Disclosure [Member] | Financial Instruments Carrying Value [Member] | Foreign [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 937 | 864 |
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Carrying (Reported) Amount, Fair Value Disclosure [Member] | Financial Instruments Carrying Value [Member] | Corporate Debt Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 2,443 | 1,922 |
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Carrying (Reported) Amount, Fair Value Disclosure [Member] | Financial Instruments Carrying Value [Member] | Collateralized Mortgage Backed Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | 2,087 | 1,341 |
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Carrying (Reported) Amount, Fair Value Disclosure [Member] | Financial Instruments Carrying Value [Member] | US States and Political Subdivisions Debt Securities [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Total Fixed maturities held to maturity | $ 1,277 | $ 1,151 |