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Group cash flow statement (Parenthetical) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from consolidated operations      
Profit/(loss) after tax for the year $ 8,851 $ 4,776 $ (1,719)
Adjustments for:      
– Taxation 3,965 1,567 993
– Finance items 1,658 773 4,702
– Share of profit after tax of equity accounted units (339) (321) (361)
– Net gains on disposal and consolidation of interests in businesses (2,344) (515) (64)
– Impairment charges net of reversals 796 249 2,791
– Depreciation and amortisation 4,375 4,794 4,645
– Provisions (including exchange differences on provisions) 535 1,417 726
Utilisation of provisions (714) (627) (585)
Utilisation of provision for post-retirement benefits (339) (370) (230)
Change in inventories (482) 292 526
Change in trade and other receivables (138) (794) 1,404
Change in trade and other payables 421 229 (431)
Other items [1] 425 (102) (295)
Cash flows from consolidated operations 16,670 11,368 12,102
Adjustment for derivative contracts transacted and not designated for hedge relationship $ (501) $ 29 $ 227
[1] Includes adjustments to add back mark to market losses of US$501 million (2016: gains of US$29 million; 2015: gains of US$227 million) mainly relating to derivative contracts transacted for operational purposes and not designated in a hedge relationship.