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Consolidated Cash Flow Statement - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating Activities    
Net income $ 1,024 $ 1,694
Depreciation and amortization 652 540
Asset impairments 74 0
Stock-based compensation 45 64
Deferred income taxes 44 (41)
Net losses on asset dispositions 57 16
Equity companies' earnings in excess of dividends paid (18) (12)
Operating working capital 117 (154)
Postretirement benefits (87) (1)
Other 113 (40)
Cash Provided by Operations 2,021 2,066
Investing Activities    
Capital spending (566) (595)
Investments in time deposits (218) (123)
Maturities of time deposits 139 70
Other 13 (29)
Cash Used for Investing (632) (677)
Financing Activities    
Cash dividends paid (1,039) (1,017)
Change in short-term debt 453 111
Debt proceeds 0 937
Debt repayments (310) (972)
Proceeds from exercise of stock options 50 114
Acquisitions of common stock for the treasury (596) (804)
Other (41) (49)
Cash Used for Financing (1,483) (1,680)
Effect of Exchange Rate Changes on Cash and Cash Equivalents (28) 23
Change in Cash and Cash Equivalents (122) (268)
Cash and Cash Equivalents - Beginning of Period 616 923
Cash and Cash Equivalents - End of Period $ 494 $ 655