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Stockholders' Equity Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders' Equity Attributable to Parent [Abstract] |
Share Repurchase Programs | The following table summarizes the share repurchases under the 2019 Share Repurchase Program.
| Shares |  | Amounts
| (in millions)
Shares repurchased in 2019 | 7.6 |  |  | $ | 337 |
Shares repurchased in 2020 | 2.6 |  |  | 100 |
Shares repurchased in 2021 | 8.6 |  |  | 540 |
Total shares repurchased under the 2019 Share Repurchase Program | 18.8 |  |  | $ | 977 |
Schedule of Stockholders Equity | Changes in common shares outstanding are as follows:
| Year ended December 31,
| 2021 |  | 2020 |  | 2019
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(1) | 643,882 |  |  | 552,362 |  |  | 267,165 |
Purchase of treasury shares(2) | (8,829,702) |  |  | (2,942,795) |  |  | (7,691,020) |
Ending balance | 207,575,978 |  |  | 213,954,858 |  |  | 216,023,826 |
_______________________________________________________________________________ (1)Includes shares issued from treasury. (2)Includes shares withheld to pay employee tax obligations upon the vesting of restricted stock or the exercise of stock options.
Schedule of Accumulated Other Comprehensive Income (Loss) | Changes to accumulated other comprehensive loss and the impact on other comprehensive income (loss) are as follows:
| Foreign Currency Translation Adjustment |  |  |  | Unrealized Gain (Loss) on Derivatives |  | Defined Benefit Plans |  | Accumulated Other Comprehensive Loss
| (in millions)
Balance as of December 31, 2018 | $ | (250) |  |  |  |  | $ | 5 |  |  | $ | (126) |  |  | $ | (371) |
Loss arising during the period | — |  |  |  |  | — |  |  | (62) |  |  | (62) |
Reclassification to earnings(1) | — |  |  |  |  | — |  |  | (2) |  |  | (2) |
Effect of exchange rate changes and deferred taxes | 62 |  |  |  |  | — |  |  | 7 |  |  | 69 |
Balance as of December 31, 2019 | (188) |  |  |  |  | 5 |  |  | (183) |  |  | (366) |
Gain arising during the period | — |  |  |  |  | — |  |  | 1 |  |  | 1 |
Reclassification to earnings(1) | — |  |  |  |  | (1) |  |  | 6 |  |  | 5 |
Effect of exchange rate changes and deferred taxes | 44 |  |  |  |  | — |  |  | (4) |  |  | 40 |
Balance as of December 31, 2020 | (144) |  |  |  |  | 4 |  |  | (180) |  |  | (320) |
Gain arising during the period | — |  |  |  |  | — |  |  | 67 |  |  | 67 |
Reclassification to earnings(1) | — |  |  |  |  | — |  |  | 12 |  |  | 12 |
Effect of exchange rate changes and deferred taxes | 3 |  |  |  |  | — |  |  | (19) |  |  | (16) |
Balance as of December 31, 2021 | $ | (141) |  |  |  |  | $ | 4 |  |  | $ | (120) |  |  | $ | (257) |
_______________________________________________________________________________ (1) Reclassifications out of accumulated other comprehensive loss to the consolidated statements of operations were not material.

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