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Stockholders' Equity - Fair Value of Awards Granted and Vested (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total granted	$ 62	$ 49
Total vested	21	20
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total granted	39	30
Total vested	20	18
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total granted	23	19
Total vested	$ 1	$ 2

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=120381028&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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