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Risk Management - Effect on Income Statement Not Designated (Details) - Energy commodity derivative contracts - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivatives | $ 151 | $ 15 | $ 272 | $ 23
Revenues-Commodity sales |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivatives | 149 | 14 | 266 | 24
Cost of sales |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivatives | 2 | (1) | 6 | (3)
Earnings from equity investments |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivatives | 0 | 2 | 0 | 2
Derivatives not designated as hedging instruments |  |  |  |
Derivative [Line Items] |  |  |  |
Gain/(loss) on settlement of derivative contracts | $ 179 | $ (6) | $ 253 | $ (2)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in 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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