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Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash | $ 355 | $ 271 | $ 387 | $ 190
Short term investments | 1,436 | 1,407 |  |
Other assets | 1,133 | 1,078 |  |
Total assets | 56,567 | 55,233 |  |
Liabilities |  |  |  |
Short term debt | 150 | 0 |  |
Long term debt | 2,708 | 2,710 |  |
Other liabilities | 4,253 | 4,123 |  |
Total liabilities | 44,323 | 43,264 |  |
Stockholders' Equity |  |  |  |
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 271,205,390 and 270,495,998 shares outstanding) | 683 | 683 |  |
Additional paid-in capital | 2,175 | 2,173 |  |
Retained earnings | 9,414 | 9,359 |  |
Accumulated other comprehensive income (loss) | 32 | (173) |  |
Treasury stock (1,834,853 and 2,544,245 shares), at cost | (60) | (73) |  |
Total stockholders’ equity | 12,244 | 11,969 | 11,756 |
Total liabilities and stockholders' equity | $ 56,567 | $ 55,233 |  |
Balance Sheet Parenthetical |  |  |  |
Common stock, par value (in usd per share) | $ 2.50 | $ 2.50 |  |
Common stock, shares authorized (in shares | 500,000,000 | 500,000,000 |  |
Common stock, shares issued (in shares) | 273,040,243 | 273,040,243 |  |
Common stock, shares outstanding (in shares) | 271,205,390 | 270,495,998 |  |
Treasury stock, shares (in shares) | 1,834,853 | 2,544,245 |  |
Parent Company |  |  |  |
Assets |  |  |  |
Investment in subsidiaries | $ 14,481 | $ 14,202 |  |
Cash | 1 | 1 | $ 4 | $ 1
Short term investments | 638 | 487 |  |
Amounts due from affiliates | 4 | 6 |  |
Other assets | 1 | 1 |  |
Total assets | 15,125 | 14,697 |  |
Liabilities |  |  |  |
Short term debt | 150 | 0 |  |
Long term debt | 2,678 | 2,680 |  |
Other liabilities | 53 | 48 |  |
Total liabilities | 2,881 | 2,728 |  |
Stockholders' Equity |  |  |  |
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 271,205,390 and 270,495,998 shares outstanding) | 683 | 683 |  |
Additional paid-in capital | 2,175 | 2,173 |  |
Retained earnings | 9,414 | 9,359 |  |
Accumulated other comprehensive income (loss) | 32 | (173) |  |
Treasury stock (1,834,853 and 2,544,245 shares), at cost | (60) | (73) |  |
Total stockholders’ equity | 12,244 | 11,969 |  |
Total liabilities and stockholders' equity | $ 15,125 | $ 14,697 |  |

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