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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities    
Profit before tax $ 786 $ 1,074
Finance income and expense 640 742
Share of after tax losses in associates and joint ventures 33 26
Depreciation, amortisation and impairment 1,393 1,274
Increase in working capital and short-term provisions (1,440) (1,044)
Gains on disposal of intangible assets (593) (596)
Non-cash and other movements (310) (468)
Cash generated from operations 509 1,008
Interest paid (296) (334)
Tax paid (288) (336)
Net cash (outflow)/inflow from operating activities (75) 338
Cash flows from investing activities    
Movement in short-term investments and fixed deposits 415 (112)
Purchase of property, plant and equipment (486) (549)
Disposal of property, plant and equipment 12 57
Purchase of intangible assets (207) (167)
Disposal of intangible assets 638 728
Purchase of non-current asset investments (14) (131)
Disposal of non-current asset investments 20 14
Payments to joint ventures (171) (6)
Payment of contingent consideration from business combinations (151) (260)
Interest received 121 75
Net cash inflow/(outflow) from investing activities 177 (351)
Net cash inflow/(outflow) before financing activities 102 (13)
Cash flows from financing activities    
Proceeds from issue of share capital 16 23
Issue of loans 0 1,992
Dividends paid (2,363) (2,368)
Hedge contracts relating to dividend payments (47) (32)
Repayment of obligations under finance leases 0 (10)
Movement in short-term borrowings 1,913 541
Net cash (outflow) / inflow from financing activities (481) 146
Net (decrease)/increase in cash and cash equivalents in the period (379) 133
Cash and cash equivalents at the beginning of the period 3,172 4,924
Exchange rate effects (27) (79)
Cash and cash equivalents at the end of the period 2,766 4,978
Cash and cash equivalents 2,978 5,239
Overdrafts $ (212) $ (261)