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Fair Value Measurements (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Disclosure [Abstract] |  |
Aggregate Principal Amount of Current and Long-Term Debt | $ 4,890 | $ 5,640
Estimated Fair Value of Debt | 5,654 | 6,505
Commodity Contract [Member] | Crude Oil | Price Swaps |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 318 |
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 1 [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 318 |
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 3 [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Crude Oil | Roll Differential Swap |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 41 | 1
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 1 [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | 0
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 2 [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 41 | 1
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 3 [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | 0
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 44 |
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps | Fair Value, Inputs, Level 1 [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 44 |
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps | Fair Value, Inputs, Level 3 [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Natural Gas | Price Swaps |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 34 | 66
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 41 |
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 34 | 66
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 41 |
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 | $ 0
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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