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Fair Value Measurements - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 $ / Mcfe $ / Barrel
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment and related charges, net of tax | $ 21 |  |  | $ 156 |
Impairment and related charges |  | $ 8,600 |  |  |
Low end of range |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Operating and capital cost estimates, percentage |  |  |  |  | 1.00%
Operating and capital cost estimates (in dollars per barrel) | $ / Barrel |  |  |  |  | 50
High end of range |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Operating and capital cost estimates, percentage |  |  |  |  | 2.00%
Operating and capital cost estimates (in dollars per barrel) | $ / Barrel |  |  |  |  | 60
Crude Oil |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Sales price (dollars per barrel) | $ / Barrel |  |  |  |  | 62.42
Unweighted arithmetic average price (in dollars per barrel) | $ / Barrel |  |  |  |  | 59.17
Unweighted arithmetic average price, period |  |  |  |  | 15 years
Crude Oil | Low end of range |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Sales price (dollars per barrel) | $ / Barrel |  |  |  |  | 40
Crude Oil | High end of range |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Sales price (dollars per barrel) | $ / Barrel |  |  |  |  | 70
Natural Gas |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unweighted arithmetic average price (in dollars per barrel) | $ / Mcfe |  |  |  |  | 3.13
Unweighted arithmetic average price, period |  |  |  |  | 15 years
Natural Gas | Low end of range |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Sales price (dollars per barrel) | $ / Mcfe |  |  |  |  | 2.00
Natural Gas | High end of range |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Sales price (dollars per barrel) | $ / Mcfe |  |  |  |  | 3.60
Gulf of Mexico |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment and related charges |  | 1,200 | $ 241 |  |
Algeria Oil and Gas Proved Properties |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment and related charges |  | 900 |  |  |
Oman, Bolivia and the Gulf of Mexico |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment and related charges |  |  | 293 |  |
Level 2 | Domestic Onshore Unproved Acreage |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment and related charges |  | $ 4,300 |  |  |
Level 3 | Measurement Input, Weighted Average Cost of Capital |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Discount rate |  | 10.00% |  |  | 10.00%
Ghana Assets | Discontinued Operations, Held-for-sale |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment and related charges, net of tax |  | $ 1,400 |  |  |
Impairment and related charges |  | 2,200 |  |  |
Oil and gas segment |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment and related charges |  | $ 6,400 | $ 581 |  |

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