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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Assets |  |  |
Cash | $ 472 | $ 345 |
Other assets | 2,591 | 2,534 |
Total assets | 66,492 | 64,711 |
Liabilities |  |  |
Short-term debt | 0 | 550 |
Long-term debt | 2,973 | 2,481 |
Other liabilities | 2,996 | 2,897 |
Total liabilities | 55,979 | 54,818 |
Stockholders' Equity |  |  |
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,844,681 and 270,881,457 shares outstanding) | 683 | 683 |
Additional paid-in capital | 2,229 | 2,221 |
Retained earnings | 9,686 | 9,755 |
Accumulated other comprehensive loss | (1,991) | (2,672) |
Treasury stock (2,195,562 and 2,158,786 shares), at cost | (94) | (94) |
Total stockholders’ equity | 10,513 | 9,893 | $ 8,548
Total liabilities and stockholders' equity | $ 66,492 | $ 64,711 |
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) | 270,844,681 | 270,881,457 |
Treasury stock, shares (in shares) | 2,195,562 | 2,158,786 |
Related Party |  |  |
Assets |  |  |
Other assets | $ 0 | $ 23 |
Liabilities |  |  |
Other liabilities | 47 | 28 |
Parent Company |  |  |
Assets |  |  |
Investment in subsidiaries | 12,684 | 11,948 |
Cash | 1 | 1 |
Short-term investments | 846 | 1,009 |
Total assets | 13,536 | 12,963 |
Liabilities |  |  |
Short-term debt | 0 | 550 |
Long-term debt | 2,973 | 2,481 |
Other liabilities | 50 | 39 |
Total liabilities | 3,023 | 3,070 |
Stockholders' Equity |  |  |
Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 270,844,681 and 270,881,457 shares outstanding) | 683 | 683 |
Additional paid-in capital | 2,229 | 2,221 |
Retained earnings | 9,686 | 9,755 |
Accumulated other comprehensive loss | (1,991) | (2,672) |
Treasury stock (2,195,562 and 2,158,786 shares), at cost | (94) | (94) |
Total stockholders’ equity | 10,513 | 9,893 |
Total liabilities and stockholders' equity | 13,536 | 12,963 |
Parent Company | Related Party |  |  |
Assets |  |  |
Other assets | 4 | 4 |
Parent Company | Nonrelated Party |  |  |
Assets |  |  |
Other assets | $ 1 | $ 1 |

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