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Consolidated statement of cash flow - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOW FROM OPERATING ACTIVITIES      
Consolidated net income $ 8,299 $ 6,206 $ 4,786
Depreciation, depletion, amortization and impairment (Note 5.3) 16,611 14,423 19,334
Non-current liabilities, valuation allowances, and deferred taxes (Note 5.5) (384) (1,559) (2,563)
(Gains) losses on disposals of assets (2,598) (263) (2,459)
Undistributed affiliates' equity earnings 42 (643) (311)
(Increase) decrease in working capital (Note 5.5) 827 (1,119) 1,683
Other changes, net (478) (524) (524)
Cash flow from operating activities 22,319 16,521 19,946
CASH FLOW USED IN INVESTING ACTIVITIES      
Intangible assets and property, plant and equipment additions (Note 7) (13,767) (18,106) (25,132)
Acquisitions of subsidiaries, net of cash acquired (800) (1,123) (128)
Investments in equity affiliates and other securities (1,368) (180) (513)
Increase in non-current loans (961) (1,121) (2,260)
Total expenditures (16,896) (20,530) (28,033)
Proceeds from disposals of intangible assets and property, plant and equipment 1,036 1,462 2,623
Proceeds from disposals of subsidiaries, net of cash sold 2,909 270 2,508
Proceeds from disposals of non-current investments 294 132 837
Repayment of non-current loans 1,025 1,013 1,616
Total divestments 5,264 2,877 7,584
Cash flow used in investing activities (11,632) (17,653) (20,449)
CASH FLOW FROM FINANCING ACTIVITIES      
Issuance (repayment) of shares: Parent company shareholders 519 100 485
Issuance (repayment) of shares: Treasury shares     (237)
Dividends paid: Parent company shareholders (2,643) (2,661) (2,845)
Dividends paid: Non-controlling interests (141) (93) (100)
Issuance of perpetual subordinated notes (Note 9)   4,711 5,616
Payments on perpetual subordinated notes (Note 9) (276) (133)  
Other transactions with non-controlling interests (4) (104) 89
Net issuance (repayment) of non-current debt (Note 15) 2,277 3,576 4,166
Increase (decrease) in current borrowings (7,175) (3,260) (597)
Increase (decrease) in current financial assets and liabilities 1,903 1,396 (5,517)
Cash flow from / (used in) financing activities (5,540) 3,532 1,060
Net increase (decrease) in cash and cash equivalents 5,147 2,400 557
Effect of exchange rates 3,441 (1,072) (2,469)
Cash and cash equivalents at the beginning of the period 24,597 23,269 25,181
Cash and cash equivalents at the end of the period (Note 15) $ 33,185 $ 24,597 $ 23,269