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Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets [Abstract] |  |  |
Proved oil and gas properties, other property, plant and equipment and other assets, carrying amount | $ 27 | $ 1,587 | $ 408
Proved oil and gas properties, other property, plant and equipment and other assets written down during the period - fair value at end of period | 7 | 319 | 201
Pretax impairment charges for proved oil and gas properties, other property, plant and equipment and other assets | 20 | 1,268 | 207
Pretax impairment charge for a commodity price-related write-down of other assets |  | 72 | 90
Pretax impairment charges for proved oil and gas properties and other assets for firm commitment contracts |  |  | $ 152
Debt Disclosure [Abstract] |  |  |
Aggregate Principal Amount of Current and Long-term Debt | 4,890 | 5,640 |
Estimated Fair Value of Debt | 5,577 | 6,505 |
Commodity Contract [Member] | Crude Oil | Price Swaps |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 15 |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 340 |  |
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 1 |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 0 |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 0 |  |
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 2 |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 15 |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 340 |  |
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 3 |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 0 |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 0 |  |
Commodity Contract [Member] | Crude Oil | Roll Differential Swap |  |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 24 | 1 |
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 1 |  |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 0 | 0 |
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 2 |  |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 24 | 1 |
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 3 |  |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 0 | 0 |
Commodity Contract [Member] | Natural Gas | Price Swaps |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 29 | 66 |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 121 |  |
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 1 |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 0 | 0 |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 0 |  |
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 2 |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 29 | 66 |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 121 |  |
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 3 |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 0 | $ 0 |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 0 |  |
Commodity Contract [Member] | Natural Gas | Basis Swaps |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 2 |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 1 |  |
Commodity Contract [Member] | Natural Gas | Basis Swaps | Fair Value, Inputs, Level 1 |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 0 |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 0 |  |
Commodity Contract [Member] | Natural Gas | Basis Swaps | Fair Value, Inputs, Level 2 |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 2 |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | 1 |  |
Commodity Contract [Member] | Natural Gas | Basis Swaps | Fair Value, Inputs, Level 3 |  |  |
Financial Assets: |  |  |
Assets, Fair Value Disclosure | 0 |  |
Financial Liabilities: |  |  |
Liabilities, Fair Value Disclosure | $ 0 |  |

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- Definition The expense recorded to reduce the value of property, plant and equipment to estimated fair value when circumstances indicate such property, plant and equipment has been impaired and to reduce the value of oil and gas assets consisting of proved properties as the estimate of future successful production from these properties is reduced. + References No definition available. + Details
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