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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ 555 $ (4)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:    
Depreciation, depletion and amortization 784 769
Impairments and other charges 312 262
Changes in assets and liabilities:    
Accounts payable 495 398
Receivables (352) (615)
Inventories (306) (5)
Other 40 (454)
Total cash flows provided by operating activities 1,528 351
Cash flows from investing activities:    
Capital expenditures (1,066) (592)
Purchases of investment securities (421) (54)
Payments to acquire businesses, net of cash acquired (148) 0
Proceeds from sales of property, plant and equipment 121 76
Sales of investment securities 114 44
Other investing activities (37) (19)
Total cash flows used in investing activities (1,437) (545)
Cash flows from financing activities:    
Dividends to shareholders (316) (312)
Payments on long-term borrowings (26) (1,623)
Other financing activities 12 294
Total cash flows used in financing activities (330) (1,641)
Effect of exchange rate changes on cash (40) (35)
Decrease in cash and equivalents (279) (1,870)
Cash and equivalents at beginning of period 2,337 4,009
Cash and equivalents at end of period 2,058 2,139
Cash payments during the period for:    
Interest 286 318
Income taxes $ 135 $ 176