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Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Notes to Consolidated Financial Statements [Abstract]

Derivative instruments

	As at December 31, 2017		As at December 31, 2016
	Assets	Liabilities	Assets	Liabilities
	$ millions		$ millions


Included in current assets and liabilities:
Foreign currency and interest derivative instruments	1	(3)	8	(3)
Derivative instruments on energy and marine transport	4	-	4	-

	5	(3)	12	(3)

Included in non-current assets and liabilities:
Foreign currency and interest derivative instruments	64	(3)	3	(5)