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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME      
(Loss) / profit for the period $ (496) $ 2,420 $ (553)
Items that may be reclassified to profit or loss (net of tax, see Note 11)      
Net movement on cash flow hedges 4 7 13
Share of other comprehensive loss of joint ventures (12)    
Foreign currency translation (638) 85 (1,836)
Other (11) 6 31
Items reclassified to profit or loss (net of tax)      
Reclassification of accumulated foreign currency translation reserve to profit or loss on disposal of discontinued operation (net of tax of US$nil)   (259)  
Reclassification of accumulated cash flow hedge reserve to profit or loss on disposal of discontinued operation (net of tax of US$7 for 2016)   53  
Other comprehensive loss for the period, net of tax (657) (108) (1,792)
Total comprehensive (loss) / income for the period, net of tax (1,153) 2,312 (2,345)
Attributable to:      
The owners of the parent (1,060) 2,233 (1,727)
Non-controlling interests (93) 79 (618)
Total comprehensive (loss) / income for the period, net of tax $ (1,153) $ 2,312 $ (2,345)