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CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities      
(Loss) / profit before tax $ (24) $ 347 $ (595)
Non-cash adjustments to reconcile profit before tax to net cash flows:      
Depreciation 1,454 1,439 1,550
Amortization 537 497 517
Impairment losses 66 192 245
Loss on disposals of non-current assets 24 20 39
Finance costs 935 830 829
Finance income (95) (69) (52)
Other non-operating losses, net 97 82 42
Share of loss/ (profit) of joint ventures and associates 412 (48) (14)
Impairment of joint ventures and associates 110 99  
Net foreign exchange loss / (gain) 71 (157) 314
Changes in trade and other receivables and prepayments (168) (129) (287)
Changes in inventories 54 (13) (43)
Changes in trade and other payables 311 (107) 173
Changes in provisions and pensions (119) (645) (185)
Interest paid (834) (789) (807)
Interest received 89 63 49
Income tax paid (445) (420) (671)
Net cash flows from operating activities of discontinued operations   683 929
Net cash flows from operating activities 2,475 1,875 2,033
Investing activities      
Proceeds from sale of property and equipment and intangible assets 8 15 18
Purchase of property and equipment and intangible assets (2,037) (1,651) (2,207)
Loans granted (2)   (102)
Repayment of loans granted     101
(Payment on) / receipts from deposits (898) 19 (361)
(Investment in) / redemption of financial assets (99) (87) 74
Acquisition of subsidiaries, net of cash acquired   7 (17)
Proceeds from sale of subsidiaries, net of cash disposed 12 (325)  
Net cash flow used in investing activities of discontinued operations   (649) (140)
Net cash flows used in investing activities (3,016) (2,671) (2,634)
Financing activities      
Net proceeds from exercise of share options and purchase of treasury shares     2
Acquisition of non-controlling interests (259) (5) (4)
Proceeds from borrowings, net of fees paid 6,193 1,882 2,052
Repayment of borrowings (5,948) (1,816) (4,840)
Dividends paid to owners of the parent (518) (61) (61)
Dividends paid to non-controlling interests (201) (106) (188)
Proceeds from sale of non-controlling interest, net of fees paid     2,307
Net cash flow used in financing activities of discontinued operations   (20) (707)
Net cash flow used in financing activities (733) (126) (1,439)
Net change in cash and cash equivalents (1,274) (922) (2,040)
Net foreign exchange difference (353) (64) (374)
Cash and cash equivalents classified as held for sale (11) 314 (314)
Cash and cash equivalents at beginning of period 2,942 3,614 6,342
Cash and cash equivalents at end of period $ 1,304 $ 2,942 $ 3,614