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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES    
Net income $ 2,255 $ 2,074
Items not involving current cash flows 1,306 1,231
Profit loss after adjustment of non cash items 3,561 3,305
Changes in operating assets and liabilities (232) (39)
Cash provided from operating activities 3,329 3,266
INVESTMENT ACTIVITIES    
Fixed asset additions (1,858) (1,807)
Purchase of subsidiaries   (1,810)
Increase in investments and other assets (651) (478)
Proceeds from disposition 332 138
Proceeds on disposal of facilities 49  
Cash used for investment activities (2,128) (3,957)
FINANCING ACTIVITIES    
Issues of debt 752 282
(Decrease) Increase in short-term borrowings (530) 386
Repayments of debt (110) (417)
Common Shares issued on exercise of stock options 44 33
Shares repurchased for tax withholdings on vesting of equity awards (11) (9)
Repurchase of Common Shares (1,271) (904)
Contributions to subsidiaries by non-controlling interests 10  
Dividends paid to non-controlling interests (38) (6)
Dividends paid (400) (385)
Cash used for financing activities (1,554) (1,020)
Effect of exchange rate changes on cash, cash equivalents and restricted cash equivalents 24 16
Net decrease in cash, cash equivalents and restricted cash equivalents during the year (329) (1,695)
Cash, cash equivalents and restricted cash equivalents, beginning of year 1,168 2,863
Cash, cash equivalents and restricted cash equivalents, end of year $ 839 $ 1,168