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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Special items	$ (69)	$ (112)	$ (304)	$ 202		$ 2	$ 12	$ (283)	$ 14	$ 435
Earnings Per Share, Diluted, Special Items Impact (in dollars per share)	$ 0.19	$ 0.31	$ 0.84	$ (0.55)		$ 0.01	$ (0.02)
Gain on equity method investments					$ 15			$ 0	$ 15	$ 0
Gain on equity method investments (in dollars per share)					$ 0.04

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- Definition

Earnings Per Share, Diluted, Gain on Equity Method Investments Impact

+ References

No definition available.

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- Definition

Earnings Per Share, Diluted, Special Items Impact

+ References

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- Definition

Special items during period

+ References

No definition available.

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- Definition

The profit or loss on sales of previously unissued stock by subsidiaries or equity investees made to investors outside the consolidated group that is not reported as operating income. Represents the difference in the parent company's carrying amount of the equity interest in the subsidiary or equity investee immediately before and after the transaction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- References

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