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Debt - Narrative (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2021 USD ($) | Dec. 31, 2022 USD ($) | May 31, 2022 USD ($) | Mar. 31, 2022 USD ($) transaction | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Feb. 28, 2022 USD ($) | Jan. 31, 2022 USD ($) | Feb. 28, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  | $ 2,716 |  |  |  |  |  |
Gain (loss) on repurchase of debt instrument |  |  |  | 155 |  |  |  |  |  |
Debt repurchase, incurred debt premium |  |  |  | $ 333 |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 6,267 | $ 505 | $ 254 |  |  |
Debt at face value |  | $ 15,855 |  |  | $ 15,855 | 17,766 |  |  |  |
Number of debt exchange transactions | transaction |  |  |  | 2 |  |  |  |  |  |
Debt instrument, exchange amount |  |  |  | $ 2,544 |  |  |  |  |  |
Debt exchange, incurred premium |  |  |  | 883 |  |  |  |  |  |
Debt premium cash component |  |  |  | 872 |  |  |  |  |  |
Expense from exchange of debt |  |  |  | 28 |  |  |  |  |  |
Concho Resources Incorporated |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  |  |  | $ 67
Business combination, notes offered in the exchange | $ 3,900 |  |  |  |  |  |  |  |  | $ 3,900
Long-term debt | 4,696 |  |  |  |  |  |  |  |  |
Adjustment to fair value of the senior notes | $ 800 |  |  |  |  |  |  |  |  |
Business combination, percent of notes offered in the exchange, tendered and accepted |  |  |  |  |  |  |  |  |  | 98.00%
Business combination, notes offered in the exchange, tendered and accepted |  |  |  |  |  |  |  |  |  | $ 3,800
Debentures | 7.0% Debentures due 2029 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 7.00% |  |  | 7.00% |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | $ 200 |  |
Debt instrument, exchange amount |  |  |  | 88 |  |  |  |  |  |
Notes Payable to Banks | 2.40% Notes due 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Retirement of debt |  | $ 329 |  |  |  |  |  |  |  |
Stated interest rate |  | 2.40% |  |  | 2.40% |  |  |  |  |
Notes Payable to Banks | 4.95% Notes due 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.95% | 4.95% |  | 4.95% |  |  |  |  |
Debt instrument, repurchased face amount |  |  | $ 1,250 |  |  |  |  |  |  |
Gain (loss) on repurchase of debt instrument |  |  | (83) |  |  |  |  |  |  |
Debt repurchase, incurred debt premium |  |  | 79 |  |  |  |  |  |  |
Notes Payable to Banks | 3.75% Notes due 2027 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.75% |  |  | 3.75% |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  | 804 |  |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 1,000 |  |
Notes Payable to Banks | 4.3% Notes due 2028 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.30% |  |  | 4.30% |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  | 777 |  |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 1,000 |  |
Notes Payable to Banks | 2.4% Notes due 2031 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 2.40% |  |  | 2.40% |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  | 273 |  |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 500 |  |
Notes Payable to Banks | 4.875% Notes due 2047 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.875% |  |  | 4.875% |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  | 481 |  |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 800 |  |
Notes Payable to Banks | 4.85% Notes due 2048 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.85% |  |  | 4.85% |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  | 381 |  |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 600 |  |
Notes Payable to Banks | 6.95% Notes due 2029 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.95% |  |  | 6.95% |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 1,549 |  |
Debt instrument, exchange amount |  |  |  | 354 |  |  |  |  |  |
Notes Payable to Banks | 7.4% Notes due 2031 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 7.40% |  |  | 7.40% |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 500 |  |
Debt instrument, exchange amount |  |  |  | 118 |  |  |  |  |  |
Notes Payable to Banks | 7.25% Notes due 2031 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 7.25% |  |  | 7.25% |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 500 |  |
Debt instrument, exchange amount |  |  |  | 100 |  |  |  |  |  |
Notes Payable to Banks | 7.2% Notes due 2031 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 7.20% |  |  | 7.20% |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 575 |  |
Debt instrument, exchange amount |  |  |  | 128 |  |  |  |  |  |
Notes Payable to Banks | 5.95% Notes due 2036 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.95% |  |  | 5.95% |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 500 |  |
Debt instrument, exchange amount |  |  |  | 174 |  |  |  |  |  |
Notes Payable to Banks | 5.9% Notes due 2038 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.90% |  |  | 5.90% |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 600 |  |
Debt instrument, exchange amount |  |  |  | 250 |  |  |  |  |  |
Notes Payable to Banks | 6.5% Notes due 2039 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.50% |  |  | 6.50% |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 2,750 |  |
Debt instrument, exchange amount |  |  |  | 1,162 |  |  |  |  |  |
Notes Payable to Banks | 5.95% Notes due 2046 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.95% |  |  | 5.95% |  |  |  |  |
Debt at face value |  |  |  |  |  |  |  | 500 |  |
Debt instrument, exchange amount |  |  |  | $ 171 |  |  |  |  |  |
Notes Payable to Banks | 3.758% Notes due 2042 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.758% |  |  | 3.758% |  |  |  |  |
Debt at face value |  | $ 785 |  |  | $ 785 |  |  |  |  |
Notes Payable to Banks | 4.025% Notes due 2062 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.025% |  |  | 4.025% |  |  |  |  |
Debt at face value |  | $ 1,770 |  |  | $ 1,770 |  |  |  |  |
Notes Payable to Banks | 2.125% Notes due 2024 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 2.125% |  | 2.125% | 2.125% |  |  |  |  |
Debt at face value |  |  |  | $ 900 |  |  |  |  |  |
Notes Payable to Banks | 2.40% Notes due 2025 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 2.40% |  | 2.40% | 2.40% |  |  |  |  |
Debt at face value |  |  |  | $ 900 |  |  |  |  |  |
Notes Payable to Banks | 3.8% Notes due 2052 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.80% |  | 3.80% | 3.80% |  |  |  |  |
Debt at face value |  |  |  | $ 1,100 |  |  |  |  |  |
Variable Rate Debt Bonds |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt at face value |  | $ 283 |  |  | $ 283 | $ 283 |  |  |  |
Floating Rate Notes | Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% – 1.12% during 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 500 |  |  |  |  |  |  |
Floating Rate Notes | Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% – 1.12% during 2021 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 1.41% |  |  | 1.41% | 1.12% |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Project finance facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 5,500 | $ 6,000 |
Minimum limit of debt for cross default provision |  | $ 200 |  |  | $ 200 |  |  |  |  |
Commercial paper program, amount outstanding |  | 0 |  |  | 0 | $ 0 |  |  |  |
Remaining borrowing capacity under revolving credit facility |  | 5,500 |  |  | 5,500 |  |  |  |  |
Commercial Paper | Conoco Phillips Commercial Paper Program |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commercial paper program, amount outstanding |  |  |  |  |  | $ 0 |  |  |  |
Letter of Credit | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, capacity available for specific purpose other than for trade purchases |  | $ 500 |  |  | $ 500 |  |  |  |  |

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