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Capital Structure - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2017 USD ($) director $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 08, 2016 USD ($)
Class of Stock [Line Items] |  |  |  |
Repurchase of debt |  | $ 17,000,000 | $ 11,000,000 |
Long-term debt | $ 6,350,000,000 | 6,347,000,000 |  |
Unsecured revolving credit facility | 1,000,000,000.00 |  |  |
Commercial Paper maximum borrowing capacity | 1,000,000,000.00 |  |  |
Additional borrowing capacity under credit facility increase provision | $ 500,000,000 |  |  |
Maximum debt to capital ratio allowed under credit facility covenant (as a percent) | 37.50% |  |  |
Credit facility, amount outstanding | $ 0 | 0 |  |
Interest paid on debt | 332,000,000 | 287,000,000 | $ 289,000,000 |
Other liabilities and accrued expenses | $ 169,000,000 | $ 132,000,000 |  |
Common stock |  |  |  |
Common stock, shares issued (in shares) | shares | 900,000,000 | 900,000,000 |  |
Common stock, shares outstanding (in shares) | shares | 355,000,000 | 366,000,000 |  |
Treasury stock, shares (in shares) | shares | 545,000,000 | 534,000,000 |  |
Reacquired shares (in shares) | shares | 16,000,000 |  |  |
Average cost of reacquired shares (in dollars per share) | $ / shares | $ 89.95 |  |  |
Reissued net shares under equity incentive plans (in shares) | shares | 5,000,000 |  |  |
Preferred stock |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 1 | $ 1 |  |
Period of issuance of common stock prior to dividend declaration date during which dividend declaration is prohibited | 90 days |  |  |
Noncumulative Perpetual Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Period after occurrence of certain tax and rating agency events in which redemption of debt in whole permissible | 90 days |  |  |
Preferred stock |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 1.00 |  |  |
Preferred stock, shares liquidation preference (in dollars per share) | $ / shares | 25,000 |  |  |
Preferred stock, redemption price (in dollars per share) | $ / shares | $ 25,000 |  |  |
Minimum |  |  |  |
Preferred stock |  |  |  |
Collective risk-based capital ratios of subsidiaries as a percentage of net written premiums of insurance business | 80.00% |  |  |
Percentage of decline in consolidated shareholders' equity from benchmark quarter | 20.00% |  |  |
Maximum |  |  |  |
Preferred stock |  |  |  |
Risk-based capital ratios as a percentage of action level risk-based capital | 175.00% |  |  |
Percentage by which consolidated shareholders' equity should increase or decrease to avoid restriction on dividends | 20.00% |  |  |
Maximum | Noncumulative Perpetual Preferred Stock |  |  |  |
Preferred stock |  |  |  |
Additional members of the board of directors | director | 2 |  |  |
3.28% Senior Notes, due 2026 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Debt instrument, face amount |  |  |  | $ 550,000,000
Note stated interest rate (as a percent) | 3.28% |  |  | 3.28%
4.20% Senior Notes, due 2046 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Debt instrument, face amount |  |  |  | $ 700,000,000
Note stated interest rate (as a percent) | 4.20% |  |  | 4.20%
5.10% Subordinated Debentures, due 2053 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Note stated interest rate (as a percent) | 5.10% |  |  |
5.75% Subordinated Debentures, due 2053 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Note stated interest rate (as a percent) | 5.75% |  |  |
Subordinated Debentures |  |  |  |
Class of Stock [Line Items] |  |  |  |
Minimum principal outstanding amount for redemption of debt in whole or in part | $ 25,000,000 |  |  |
Period after occurrence of certain tax and rating agency events in which redemption of debt in whole permissible | 90 days |  |  |
Maximum period for deferment of interest payment | 5 years |  |  |
6.50% Junior Subordinated Debentures, due 2067 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Note stated interest rate (as a percent) | 6.50% |  |  |
Long-term debt | $ 500,000,000 |  |  |
6.125% Junior Subordinated Debentures, due 2067 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Note stated interest rate (as a percent) | 6.125% |  |  |
Long-term debt | $ 224,000,000 |  |  |
The Debentures |  |  |  |
Class of Stock [Line Items] |  |  |  |
Maximum period for deferment of interest payment | 10 years |  |  |
Reserved common stock authorized and unissued for debentures obligations (in shares) | shares | 75,000,000 |  |  |
7.45% Senior Notes, due 2019 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Note stated interest rate (as a percent) | 7.45% |  |  |
Threshold percentage of repurchase or redemption of outstanding principal debentures for non applicability of promises and covenants contained in the new RCC | 10.00% |  |  |
Period within which threshold percentage of outstanding principal of debentures is to be purchased for non applicability of promises and covenants contained in the new RCC | 1 year |  |  |
Specified period within which percentage of outstanding principal of debentures is to be purchased for non applicability of promises and covenants contained in the new RCC | 10 years |  |  |
7.45% Senior Notes, due 2019 | Maximum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Percentage of repurchase or redemption of outstanding principal debentures within specified period for non applicability of promises and covenants contained in the new RCC | 25.00% |  |  |
Commercial Paper |  |  |  |
Class of Stock [Line Items] |  |  |  |
Amount of commercial paper outstanding | $ 0 | $ 0 |  |
Limited Partnership |  |  |  |
Class of Stock [Line Items] |  |  |  |
Other liabilities and accrued expenses | $ 132,000,000 | $ 45,000,000 |  |
London Interbank Offered Rate (LIBOR) | 5.10% Subordinated Debentures, due 2053 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Interest rate spread over LIBOR (as a percent) | 3.165% |  |  |
London Interbank Offered Rate (LIBOR) | 5.75% Subordinated Debentures, due 2053 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Interest rate spread over LIBOR (as a percent) | 2.938% |  |  |
London Interbank Offered Rate (LIBOR) | 6.50% Junior Subordinated Debentures, due 2067 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Interest rate spread over LIBOR (as a percent) | 2.12% |  |  |
London Interbank Offered Rate (LIBOR) | 6.125% Junior Subordinated Debentures, due 2067 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Interest rate spread over LIBOR (as a percent) | 1.935% |  |  |

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