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Risk Management - Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | $ 72 | $ 178
Derivatives Liability | (488) | (395)
Energy commodity derivative contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 48 | 140
Derivatives Liability | (162) | (113)
Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 24 | 38
Derivatives Liability | (309) | (278)
Foreign currency contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (17) | (4)
Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 55 | 126
Derivatives Liability | (462) | (386)
Derivatives designated as hedging instruments | Energy commodity derivative contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 31 | 89
Derivatives Liability | (136) | (104)
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivative contracts - current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 30 | 77
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivative contracts - current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (93) | (75)
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Deferred charges and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 1 | 12
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (43) | (29)
Derivatives designated as hedging instruments | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 24 | 37
Derivatives Liability | (309) | (278)
Derivatives designated as hedging instruments | Interest rate contracts | Fair value of derivative contracts - current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 0 | 0
Derivatives designated as hedging instruments | Interest rate contracts | Fair value of derivative contracts - current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (101) | (120)
Derivatives designated as hedging instruments | Interest rate contracts | Deferred charges and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 24 | 37
Derivatives designated as hedging instruments | Interest rate contracts | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (208) | (158)
Derivatives designated as hedging instruments | Foreign currency contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 0 | 0
Derivatives Liability | (17) | (4)
Derivatives designated as hedging instruments | Foreign currency contracts | Fair value of derivative contracts - current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 0 | 0
Derivatives designated as hedging instruments | Foreign currency contracts | Fair value of derivative contracts - current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (9) | (2)
Derivatives designated as hedging instruments | Foreign currency contracts | Deferred charges and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 0 | 0
Derivatives designated as hedging instruments | Foreign currency contracts | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (8) | (2)
Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 17 | 52
Derivatives Liability | (26) | (9)
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivative contracts - current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 16 | 49
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivative contracts - current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (25) | (8)
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Deferred charges and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Asset | 1 | 3
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | $ (1) | $ (1)

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-22 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-7 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (c)(2) -SubTopic 20 -Topic 860 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4D + Details
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