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Stockholders' Equity - Fair Value of Awards Granted and Vested (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares granted	$ 44	$ 36	$ 34
Fair value of restricted shares vested	18	47	22
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares granted	28	20	19
Fair value of restricted shares vested	15	23	22
PSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares granted	0	0	15
Fair value of restricted shares vested	3	15	0
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares granted	16	16	0
Fair value of restricted shares vested	$ 0	$ 9	$ 0

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.

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