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Risk Management - Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | $ 1,102 | $ 460
Derivatives Liability | (79) | (65)
Energy commodity derivative contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 262 | 56
Derivatives Liability | (25) | (58)
Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 818 | 358
Derivatives Liability | (18) | (1)
Foreign currency contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 22 | 46
Derivatives Liability | (36) | (6)
Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 1,082 | 452
Derivatives Liability | (67) | (58)
Derivatives designated as hedging instruments | Energy commodity derivative contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 242 | 48
Derivatives Liability | (19) | (51)
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivatives contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 150 | 31
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (17) | (43)
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Deferred charges and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 92 | 17
Derivatives designated as hedging instruments | Energy commodity derivative contracts | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (2) | (8)
Derivatives designated as hedging instruments | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 818 | 358
Derivatives Liability | (12) | (1)
Derivatives designated as hedging instruments | Interest rate contracts | Fair value of derivatives contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 128 | 45
Derivatives designated as hedging instruments | Interest rate contracts | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (3) | 0
Derivatives designated as hedging instruments | Interest rate contracts | Deferred charges and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 690 | 313
Derivatives designated as hedging instruments | Interest rate contracts | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (9) | (1)
Derivatives designated as hedging instruments | Foreign currency contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 22 | 46
Derivatives Liability | (36) | (6)
Derivatives designated as hedging instruments | Foreign currency contracts | Fair value of derivatives contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 0 | 0
Derivatives designated as hedging instruments | Foreign currency contracts | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (22) | (6)
Derivatives designated as hedging instruments | Foreign currency contracts | Deferred charges and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 22 | 46
Derivatives designated as hedging instruments | Foreign currency contracts | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (14) | 0
Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 20 | 8
Derivatives Liability | (12) | (7)
Derivatives not designated as hedging instruments | Energy commodity derivative contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 20 | 8
Derivatives Liability | (6) | (7)
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Fair value of derivatives contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 16 | 8
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | (5) | (7)
Derivatives not designated as hedging instruments | Energy commodity derivative contracts | Deferred charges and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 4 | 0
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) | 0
Derivatives not designated as hedging instruments | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 0 | 0
Derivatives Liability | (6) | 0
Derivatives not designated as hedging instruments | Interest rate contracts | Fair value of derivatives contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Assets | 0 | 0
Derivatives not designated as hedging instruments | Interest rate contracts | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives Liability | $ (6) | $ 0

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details
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