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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

X

- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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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
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-Topic 815
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Aggregate loss on all derivative instruments charged against earnings during the period, before tax effects.

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