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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Assets |  |  |
Cash | $ 475 | $ 536 |
Total assets | 60,927 | 66,639 |
Liabilities |  |  |
Short term debt | 243 | 0 |
Long term debt | 2,538 | 2,779 |
Other liabilities | 2,983 | 3,377 |
Total liabilities | 52,102 | 53,830 |
Stockholders' Equity |  |  |
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,895,902 and 271,363,999 shares outstanding) | 683 | 683 |
Additional paid-in capital | 2,220 | 2,215 |
Retained earnings | 9,572 | 9,663 |
Accumulated other comprehensive (loss) income | (3,557) | 320 |
Treasury stock (2,144,341 and 1,676,244 shares), at cost | (93) | (72) |
Total stockholders’ equity | 8,825 | 12,809 | $ 12,707
Total liabilities and stockholders' equity | $ 60,927 | $ 66,639 |
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) | 270,895,902 | 271,363,999 |
Treasury stock, shares (in shares) | 2,144,341 | 1,676,244 |
Parent Company |  |  |
Assets |  |  |
Investment in subsidiaries | $ 11,063 | $ 14,937 |
Cash | 2 | 1 |
Short term investments | 578 | 685 |
Amounts due from affiliates | 4 | 3 |
Total assets | 11,647 | 15,626 |
Liabilities |  |  |
Short term debt | 243 | 0 |
Long term debt | 2,538 | 2,779 |
Other liabilities | 41 | 38 |
Total liabilities | 2,822 | 2,817 |
Stockholders' Equity |  |  |
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,895,902 and 271,363,999 shares outstanding) | 683 | 683 |
Additional paid-in capital | 2,220 | 2,215 |
Retained earnings | 9,572 | 9,663 |
Accumulated other comprehensive (loss) income | (3,557) | 320 |
Treasury stock (2,144,341 and 1,676,244 shares), at cost | (93) | (72) |
Total stockholders’ equity | 8,825 | 12,809 |
Total liabilities and stockholders' equity | $ 11,647 | $ 15,626 |

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