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Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	10. Stock-Based Compensation   Total expense for all stock-based compensation arrangements was $41 million and $104 million for the three and nine months ended September 30, 2019, respectively and $30 million and $88 million for the three and nine months ended September 30, 2018, respectively. The total income tax benefit recognized in the Consolidated Statements of Income (Loss) for all stock-based compensation arrangements was $5 million and $13 million for the three and nine months ended September 30, 2019, respectively, and $6 million and $12 million for the three and nine months ended September 30, 2018, respectively.

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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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