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Stock-Based Compensation	9 Months Ended
	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	10. Stock-Based Compensation   Total expense for all stock-based compensation arrangements was $19 million and $59 million for the three and nine months ended September 30, 2021, respectively and $24 million and $78 million for the three and nine months ended September 30, 2020, respectively. There was no income tax benefit recognized in the Consolidated Statements of Income (Loss) for stock-based compensation arrangements under the Plan for each of the three and nine months ended September 30, 2021 and 2020.

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- Definition

The entire disclosure for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-URI http://asc.fasb.org/topic&trid=2228938

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- References

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