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Subsequent Events (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Nov. 11, 2019	Sep. 30, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Employee severance, facilities lease-related costs, and other employee-related cash expenditures		$ 18	$ 11
Minimum | Subsequent Event
Subsequent Event [Line Items]
Employee severance, facilities lease-related costs, and other employee-related cash expenditures	$ 20
Maximum | Subsequent Event
Subsequent Event [Line Items]
Employee severance, facilities lease-related costs, and other employee-related cash expenditures	$ 25

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585

+ Details

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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