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Stockholders' Equity (Narrative) (Details) $ / shares in Units, shares in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2022 USD ($) | Nov. 02, 2021 USD ($) | Jan. 07, 2021 | May 31, 2022 USD ($) $ / shares | Mar. 31, 2022 $ / shares shares | Mar. 31, 2021 $ / shares | Dec. 31, 2021 shares
Stockholders Equity [Abstract] |  |  |  |  |  |  |
Common stock, shares issued (in shares) | shares |  |  |  |  | 661 |  | 663
Dividends rate per share |  |  |  |  | $ 1.00 | $ 0.30 |
Fixed Dividend [Member] |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |
Percentage Increase In Quarterly Dividend |  |  |  |  | 45.00% |  |
Dividends rate per share |  |  |  |  | $ 0.16 |  |
Subsequent Event |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |
Dividend payable, per share |  |  |  | $ 1.27 |  |  |
Dividends payable, year |  |  |  | 2022 |  |  |
Subsequent Event | Fixed Dividend [Member] |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |
Dividend payable amount | $ |  |  |  | $ 106 |  |  |
Dividends rate per share |  |  |  | $ 0.16 |  |  |
Subsequent Event | Variable Dividend [Member] |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |
Dividend payable, per share |  |  |  | $ 1.11 |  |  |
Dividend payable amount | $ |  |  |  | $ 732 |  |  |
Devon and WPX Agreement [Member] |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |
Conversion of common stock into right to recieve per share |  |  | 0.5165 |  |  |  |
Share Repurchase Program [Member] |  |  |  |  |  |  |
Stockholders Equity [Abstract] |  |  |  |  |  |  |
Repurchase of common stock | $ | $ 1,600 | $ 1,000 |  | $ 2,000 |  |  |
Repurchase program expiration date | May 31, 2022 | Dec. 31, 2022 |  | May 04, 2023 |  |  |

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