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Stockholders' Equity (Summary of Purchases of Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
3.0 Billion Dollar Share Repurchase Program Closed Member |  |  |
Stockholders Equity [Line Items] |  |  |
Total Number of Shares Purchased | 19,350 | 11,708 | 13,983
Dollar Value of Shares Purchased | $ 992 | $ 718 | $ 589
Average Price Paid per Share | $ 51.23 | $ 61.36 | $ 42.15
Share Repurchase Program Open [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Total Number of Shares Purchased | 45,041 |  |
Dollar Value of Shares Purchased | $ 2,299 |  |
Average Price Paid per Share | $ 51.05 |  |

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