CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOW FROM OPERATING ACTIVITIES
Net income	$ 631	$ 708
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization of assets	973	921
Deferred income tax provision	10	94
Other noncash charges (benefits) to income	225	(23)
Asset impairments and related items	0	30
Gain on sale of assets, net	(7)	(33)
Changes in operating assets and liabilities, net	(884)	(688)
Net cash provided by operating activities	948	1,009
CASH FLOW FROM INVESTING ACTIVITIES
Capital expenditures	(1,259)	(1,032)
Change in capital accrual	(51)	(45)
Payments for purchases of assets and businesses	(69)	(177)
Sales of assets, net	16	275
Equity investments and other, net	(52)	8
Net cash used by investing activities	(1,415)	(971)
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from long-term debt, net	0	978
Payments of long-term debt	0	(500)
Proceeds from issuance of common stock	16	10
Purchase of treasury stock	(237)	0
Cash dividends paid	(591)	(592)
Other financing, net	(2)	0
Net cash used by financing activities	(814)	(104)
Decrease in cash and cash equivalents	(1,281)	(66)
Cash and cash equivalents — beginning of period	3,033	1,672
Cash and cash equivalents — end of period	$ 1,752	$ 1,606