Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

Name:	us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosures [Line Items]
Other Tax Expense (Benefit)	$ 26
Chilean tax reform [Member]
Income Tax Disclosures [Line Items]
Effective Income Tax Rate Reconciliation, Percent	25.00%
Chilean tax reform [Member] \| Subsequent Event [Member]
Income Tax Disclosures [Line Items]
Effective Income Tax Rate Reconciliation, Percent		27.00%	25.50%