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Derivative Financial Instruments (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Realized net gains (losses)	$ 29	$ 0	$ 0
Net derivative gains (losses)	88	(7)	(10)
Winter Storm Uri
Derivative Instruments, Gain (Loss) [Line Items]
Realized net gains (losses)	112	0	0
Derivatives not designated as cash flow hedges | Natural gas derivatives | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized net (losses) gains	(25)	6	(14)
Realized net gains (losses)	$ 1	$ (13)	$ 4

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 815
-SubTopic 10
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

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-Topic 230
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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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