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Stockholders' Equity (Details 2) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 03, 2021 | Feb. 13, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum amount up to which company common stock is authorized to be repurchased |  |  |  | $ 1,500 | $ 1,000
Purchase of treasury stock value | $ 540 | $ 100 | $ 337 |  |
Number of treasury shares retired | 8,900,000 | 2,800,000 |  |  |
Treasury Stock, Retired, Cost Method, Amount | $ 0 | $ 0 | $ 0 |  |
Treasury Stock, Shares | 27,962 | 102,843 |  |  |
Change in common shares issued and outstanding |  |  |  |  |
Beginning balance | 213,954,858 | 216,023,826 | 222,818,495 |  |
Exercise of stock options | 1,806,940 | 321,465 | 629,186 |  |
Issuance of restricted stock | 643,882 | 552,362 | 267,165 |  |
Purchase of treasury shares | (8,829,702) | (2,942,795) | (7,691,020) |  |
Ending balance | 207,575,978 | 213,954,858 | 216,023,826 |  |
Paid-In Capital |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount | $ 58 | $ 17 | $ 110 |  |
Retained Earnings |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount | 496 | 90 | 733 |  |
Treasury Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Purchase of treasury stock value | 540 | 100 | 337 |  |
Treasury Stock, Retired, Cost Method, Amount | $ (554) | $ (107) | $ (843) |  |

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