Debt - Textual (Details) - USD ($) |
3 Months Ended | |||
|---|---|---|---|---|
Jan. 15, 2021 |
Mar. 31, 2021 |
Feb. 08, 2021 |
Dec. 31, 2020 |
|
| Debt [Abstract] | ||||
| Debt balance | $ 20,000,000,000.0 | $ 15,400,000,000 | ||
| Short Term Debt [Line Items] | ||||
| Commercial Paper Program, Amount Outstanding | $ 309,000,000 | |||
| Debt Instrument [Line Items] | ||||
| Financing Receivable, Credit Quality, Additional Information | In October 2020, Moody’s affirmed its rating of our senior long-term debt of “A3” with a “stable” outlook, and affirmed its rating of our short-term debt as “Prime-2.” In January 2021, Fitch affirmed its rating of our long-term debt as “A” with a “stable” outlook and affirmed its rating of our short-term debt as “F1+.” On January 25, 2021, S&P revised its industry risk assessment of the E&P industry to “Moderately High” from “Intermediate” based on a view of increasing risks from the energy transition, price volatility, and weaker profitability. On February 11, 2021, S&P downgraded its rating of our long-term debt from “A” to “A-” with a “stable” outlook and downgraded its rating of our short-term debt from “A-1” to “A-2.” We do not have any ratings triggers on any of our corporate debt that would cause an automatic default, and thereby impact our access to liquidity, upon downgrade of our credit ratings. If our credit ratings are downgraded from their current levels, it could increase the cost of corporate debt available to us and restrict our access to the commercial paper markets. If our credit rating were to deteriorate to a level prohibiting us from accessing the commercial paper market, we would still be able to access funds under our revolving credit facility. | |||
| Concho Resources Inc [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Adjustment to fair value of the senior notes | $ 800,000,000 | |||
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | 4,696,000,000 | |||
| Business Combination, Notes Offered In Exchange | $ 3,900,000,000 | $ 3,900,000,000 | ||
| Business Combination, Percent Of Notes Offered Tendered And Exchanged For New Debt | 98.00% | |||
| Business Combination, Tendered And Exchanged Notes For New Debt | $ 3,800,000,000 | |||
| Debt Instrument Face Amount | $ 67,000,000 | |||
| Moody's, A3 Rating [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Debt Instrument, Credit Rating | In October 2020, Moody’s affirmed its rating of our senior long-term debt of “A3” with a “stable” outlook | |||
| Fitch, A Rating [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Debt Instrument, Credit Rating | In January 2021, Fitch affirmed its rating of our long-term debt as “A” with a “stable” outlook | |||
| Standard & Poor's, A- Rating [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Debt Instrument, Credit Rating | On February 11, 2021, S&P downgraded its rating of our long-term debt from “A” to “A-” with a “stable” outlook | |||
| Revolving Credit Facility [Member] | ||||
| Short Term Debt [Line Items] | ||||
| Maximum borrowing capactiy under revolving credit facility | $ 6,000,000,000.0 | |||
| Remaining borrowing capacity under revolving credit facility | $ 5,700,000,000 | |||
| Maturity period of commercial paper (in days) | P90D | |||
| Commercial Paper Program, Amount Outstanding | $ 0 | 300,000,000 | ||
| Commercial Paper Program | 6,000,000,000.0 | |||
| Minimum Limit of Debt for Cross Default Provision | 200,000,000 | |||
| Letter of Credit [Member] | ||||
| Short Term Debt [Line Items] | ||||
| Commercial Paper Program, Amount Outstanding | $ 0 | |||
| Letter of Credit [Member] | Maximum [Member] | ||||
| Short Term Debt [Line Items] | ||||
| Commercial Paper Program, Capacity | 500,000,000 | |||
| VRDB [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Debt Instrument Face Amount | 283,000,000 | |||
| ConocoPhillips Commercial Paper Program [Member] | Commercial Paper [Member] | ||||
| Short Term Debt [Line Items] | ||||
| Commercial Paper Program, Amount Outstanding | $ 300,000,000 |