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Stockholders' Equity - Fair Value of Awards Granted and Vested (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of awards granted	$ 41	$ 35
Total fair value of awards vested	17	44
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of awards granted	25	19
Total fair value of awards vested	14	20
Performance Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of awards vested	3	15
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of awards granted	16	16
Total fair value of awards vested	$ 0	$ 9

X

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value

+ References

No definition available.

+ Details

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X

- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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

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