CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOW FROM OPERATING ACTIVITIES
Net income	$ 708	$ 117
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization of assets	921	942
Deferred income tax (benefit) provision	94	(108)
Other noncash (gains) charges to income	(23)	84
Asset impairments and related items	30	13
Gain on sale of assets, net	(33)
Changes in operating assets and liabilities, net	(688)	(535)
Other operating, net		(8)
Net cash provided by operating activities	1,009	505
CASH FLOW FROM INVESTING ACTIVITIES
Capital expenditures	(1,032)	(722)
Change in capital accrual	(45)	(41)
Payments for purchases of assets and businesses	(177)	(19)
Sale of assets, net	275
Other investing, net	8	110
Net cash used by investing activities	(971)	(672)
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from long-term debt, net	978
Payments of long-term debt	(500)
Proceeds from issuance of common stock	10	12
Cash dividends paid	(592)	(584)
Net cash used by financing activities	(104)	(572)
Decrease in cash and cash equivalents	(66)	(739)
Cash and cash equivalents - beginning of period	1,672	2,233
Cash and cash equivalents - end of period	$ 1,606	$ 1,494