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Derivative and Financial Instruments - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Derivative [Line Items] |  |  |  |  |  |
Proceeds from sales and redemptions of investments in debt securities classified as available for sale | $ 86,000,000 | $ 173,000,000 |  | $ 201,000,000 | $ 320,000,000 |
Derivative, net liability position, aggregate fair value | 326,000,000 |  |  | 326,000,000 |  | $ 281,000,000
Collateral already posted, aggregate fair value | 6,000,000 |  |  | $ 6,000,000 |  | $ 0
Minimum |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Investments and long-term receivables, remaining maturity |  |  |  | 1 year |  |
Maximum |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Investments and long-term receivables, remaining maturity |  |  |  | 7 years |  |
In event of downgrade below investment grade |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Additional collateral, aggregate fair value | $ 238,000,000 |  |  | $ 238,000,000 |  |
Accounts Receivable | Maximum |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Credit derivative, term |  |  |  | 30 days |  |
Concho Resources Incorporated | Commodity Contract |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gains (losses) from commodity derivatives |  |  | $ (305,000,000) |  |  |
Increase (decrease) in commodity contract assets and liabilities |  | $ 69,000,000 | $ 692,000,000 |  |  |

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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- Definition Term of the credit risk derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5708775-113959 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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- Definition The increase (decrease) during the reporting period in the assets (liabilities) created through trading commodity-based derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26853-111562 + Details
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