Trade and Other Receivables - Schedule of trade and other receivables, net (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Amazonas Distribuidora de Energia [member]
Disclosure of trade and other receivables [line items]
Finance lease receivable	$ 199	$ 233

The amount of receivables related to finance leases.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_FinanceLeaseReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant