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Stockholders' Equity (Summary of Purchases of Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
5.0 Billion Dollar Share Repurchase Program Closed [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased | 6,675 | 5,188 | 4,428 | 5,465 | 3,795 | 10,090 | 16,291 | 19,350 | 11,708 | 13,983
Dollar Value of Shares Purchased | $ 295 | $ 256 | $ 193 | $ 247 | $ 200 | $ 545 | $ 744 | $ 992 | $ 718 | $ 589
Average Price Paid per Share | $ 44.23 | $ 49.4 | $ 43.47 | $ 45.17 | $ 52.7 | $ 53.96 | $ 45.67 | $ 51.23 | $ 61.36 | $ 42.15
Share Repurchase Program Open [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased |  |  |  |  |  |  | 61,332 |  |  |
Dollar Value of Shares Purchased |  |  |  |  |  |  | $ 3,043 |  |  |
Average Price Paid per Share |  |  |  |  |  |  | $ 49.62 |  |  |

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