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Capital Stock - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class Of Stock [Line Items] |  |  |
Common stock cash dividends paid | $ 37 | $ 148 | $ 138
Dividends, share-based compensation | 1 | 2 | 1
Common stock repurchased | 0 | 0 | 220
Common Stock |  |  |
Class Of Stock [Line Items] |  |  |
Common stock cash dividends paid | $ 37 | $ 148 | 138
Common stock repurchased |  |  | $ 220
Common stock repurchased (in shares) | 0 | 0 | 8,936,302
Common Stock | Payments for Share Repurchases Related to Employee Stock Based Compensation |  |  |
Class Of Stock [Line Items] |  |  |
Common stock repurchased (in shares) | 0 | 0 | 0

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