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Risk Management - Not Designated as Hedges Effect on Income Statements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Gain/(loss) recognized in income on derivatives | $ 24 | $ 29 | $ (7)
Energy commodity derivative contracts |  |  |
Derivative [Line Items] |  |  |
Loss on Derivative Instruments |  | 8 | 4
Gain on Derivative Instruments | 11 |  |
Commodity Sales | Energy commodity derivative contracts |  |  |
Derivative [Line Items] |  |  |
Gain/(loss) recognized in income on derivatives | (1) | 33 | (9)
Cost of Sales | Energy commodity derivative contracts |  |  |
Derivative [Line Items] |  |  |
Gain/(loss) recognized in income on derivatives | 25 | (7) | 2
Earnings from Equity Investments | Energy commodity derivative contracts |  |  |
Derivative [Line Items] |  |  |
Gain/(loss) recognized in income on derivatives | $ 0 | $ 3 | $ 0

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- Definition Amount of increase in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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- Definition Aggregate loss on all derivative instruments charged against earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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