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Capital Stock - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Class of Stock [Line Items] |  |  |
Common stock cash dividends paid |  | $ 37 | $ 111
Dividends, share-based compensation |  | 1 |
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock cash dividends paid | $ 37 | $ 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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