Amount of capital expenditure attributable to discontinued operations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760

Name:	us-gaap_CapitalExpenditureDiscontinuedOperations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Segment Reporting - Narrative (Details) $ in Millions	12 Months Ended
Segment Reporting - Narrative (Details) $ in Millions	Dec. 31, 2018 segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of business segments \| segment	2
Discontinued Operations
Segment Reporting Information [Line Items]
Discontinued operations capital expenditures \| $		$ 12	$ 70