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Common Stockholders' Equity (Schedule of Changes in Shares of Common Stock Outstanding) (Details) - shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Common Stock Shares Outstanding [Roll Forward] |  |  |
Balance, beginning of year | 264,546,100 | 265,170,882 | 266,737,725
Shares issued | 706,333 | 745,612 | 1,062,086
Shares repurchased | (8,707,676) | (1,370,394) | (2,628,929)
Balance, end of year | 256,544,757 | 264,546,100 | 265,170,882

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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