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Capital Stock - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Class of Stock [Line Items] |  |
Common stock cash dividends paid | $ 0 | $ 37
Dividends, share-based compensation |  | 1
Common Stock |  |
Class of Stock [Line Items] |  |
Common stock cash dividends paid |  | $ 37
Common Stock | Payments for Share Repurchases Related to Employee Stock Based Compensation |  |
Class of Stock [Line Items] |  |
Common stock repurchased (in shares) | 0 |

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