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Debt - Textual (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Debt [Abstract] |  |  |  |  |
Debt balance |  | $ 15,387,000,000 | $ 15,387,000,000 |  | $ 14,895,000,000
Short Term Debt [Line Items] |  |  |  |  |
Proceeds from Issuance of Commercial Paper |  | 300,000,000 | 300,000,000 | $ 0 |
Commercial Paper Program, Amount Outstanding |  | 240,000,000 | $ 240,000,000 |  |
Moody's, A3 Rating [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Credit Rating |  |  | and Moody’s affirmed its rating of “A3” with a “stable” outlook. |  |
Fitch, A Rating [Member] | Subsequent Event [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Credit Rating | Fitch affirmed its rating of “A” with a “stable” outlook |  |  |  |
Standard & Poor's, A Rating [Member] | Subsequent Event [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Credit Rating | In October 2020, S&P affirmed its “A” rating on our senior long-term debt and revised its outlook to “stable” from “negative,” |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |
Maximum borrowing capactiy under revolving credit facility |  | 6,000,000,000.0 | $ 6,000,000,000.0 |  |
Line of Credit Facility, Expiration Date |  |  | May 31, 2023 |  |
Remaining borrowing capacity under revolving credit facility |  | 5,700,000,000 | $ 5,700,000,000 |  |
Commercial Paper Program, Amount Outstanding |  | 0 | 0 |  | 0
Letter of Credit [Member] |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |
Commercial Paper Program, Amount Outstanding |  | 0 | 0 |  | 0
Letter of Credit [Member] | Maximum [Member] |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |
Commercial Paper Program, Capacity |  | 500,000,000 | 500,000,000 |  |
VRDB [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument Face Amount |  | 283,000,000 | 283,000,000 |  |
Conoco Phillips Commercial Paper Program [Member] | Commercial Paper [Member] |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |
Maximum borrowing capactiy under revolving credit facility |  | 6,000,000,000.0 | 6,000,000,000.0 |  |
Commercial Paper Program, Amount Outstanding |  | $ 300,000,000 | $ 300,000,000 |  | $ 0
Conoco Phillips Commercial Paper Program [Member] | Commercial Paper [Member] | Maximum [Member] |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |
Maturity period of commercial paper (in days) |  |  | P90D |  |

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- Definition Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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