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Stockholders' Equity - Fair Value of Awards Granted and Vested (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares granted	$ 36	$ 34	$ 28
Fair value of restricted shares vested	47	22	39
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares granted	20	19	17
Fair value of restricted shares vested	23	22	23
Performance Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares granted	0	15	11
Fair value of restricted shares vested	15	0	16
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted shares granted	16	0	0
Fair value of restricted shares vested	$ 9	$ 0	$ 0

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- Definition

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

+ References

No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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