Financing Receivables (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) agreement	Dec. 31, 2016 USD ($)
Schedule of Financing Receivables [Line Items]
Financing receivable	$ 194	$ 256
Number of Foninvemem Agreements \| agreement	3
Foninvemem Agreement, collection period		10 years
ARGENTINA
Schedule of Financing Receivables [Line Items]
Financing receivable	$ 177	$ 236
Derivative Assets, Gross	240	255
Brazil
Schedule of Financing Receivables [Line Items]
Financing receivable	$ 17	$ 20

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_NotesReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant