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Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 02, 2021 USD ($) $ / shares | Jan. 07, 2021 shares | Sep. 30, 2021 $ / shares shares | Jun. 30, 2021 $ / shares | Mar. 31, 2021 $ / shares | Sep. 30, 2020 $ / shares | Jun. 30, 2020 $ / shares | Mar. 31, 2020 $ / shares | Sep. 30, 2021 shares | Dec. 31, 2020 shares
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |
Conversion of common stock into right to recieve per share |  | 0.5165 |  |  |  |  |  |  | 0.5165 |
Common stock, shares issued (in shares) | shares |  |  | 677,000,000 |  |  |  |  |  | 677,000,000 | 382,000,000
Dividends rate per share |  |  | $ 0.49 | $ 0.34 | $ 0.30 | $ 0.11 | $ 0.11 | $ 0.09 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | $ | $ 1,000 |  |  |  |  |  |  |  |  |
Repurchase program expiration date | Dec. 31, 2022 |  |  |  |  |  |  |  |  |
Dividend payable, per share | $ 0.84 |  |  |  |  |  |  |  |  |
Dividends payable, year | 2021 |  |  |  |  |  |  |  |  |
Subsequent Event | Fixed Dividend [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend payable amount | $ | $ 74 |  |  |  |  |  |  |  |  |
Dividends rate per share | $ 0.11 |  |  |  |  |  |  |  |  |
Subsequent Event | Variable Dividend [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |
Dividend payable, per share | $ 0.73 |  |  |  |  |  |  |  |  |
Dividend payable amount | $ | $ 494 |  |  |  |  |  |  |  |  |
Devon and WPX Agreement [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |  |  |  |
Conversion of common stock into right to recieve per share |  | 0.5165 |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  | 290,000,000 | 289,900,000 |  |  |  |  |  | 289,900,000 |

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