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Stock-Based Compensation	6 Months Ended
	Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	10. Stock-Based Compensation   On May 28, 2019, the Company granted 65,752 restricted stock awards with a fair value of $21.90 per share.  The awards were granted to non-employee members of the board of directors and vest on the first anniversary of the grant date. Total stock-based compensation for all stock-based compensation arrangements under the Plan and the 2018 Plan was $30 million and $63 million for the three and six months ended June 30, 2019, respectively and $31 million and $58 million for the three and six months ended June 30, 2018, respectively. The total income tax benefit recognized in the Consolidated Statements of Income (Loss) for all stock-based compensation arrangements under the Plan was $4 million and $8 million for the three and six months ended June 30, 2019 and $4 million and $6 million for the three and six months ended June 30, 2018, respectively.

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- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-URI http://asc.fasb.org/subtopic&trid=2208855

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- References

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