Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net income	$ 1,750	$ 1,502
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	967	888
Pension and other postretirement benefits, net	123	3
Deferred income taxes	(126)	22
Net gain on disposal of assets	(14)	(3)
Equity method investments, net	(39)	(4)
Changes in the fair value of derivative instruments	(35)	(54)
Changes in:
Current receivables	424	(974)
Inventories	(731)	(1,330)
Current accounts payable and accrued liabilities	318	2,028
All other, net	85	(28)
Net cash provided by operating activities	2,722	2,050
Investing activities:
Additions to property, plant and equipment	(952)	(733)
Acquisitions, net of cash acquired	(2,831)	(1,515)
Disposal of assets	19	12
Investments—acquisitions, loans and contributions	(341)	(113)
Investments—redemptions and repayments	3	76
All other, net	78	22
Net cash used in investing activities	(4,024)	(2,251)
Financing activities:
Long-term debt – borrowings	2,903	0
Long-term debt – repayments	(32)	(16)
Debt issuance costs	(19)	(2)
Issuance of common stock	21	37
Common stock repurchased	(1,449)	(2,341)
Dividends paid	(386)	(358)
Distributions to noncontrolling interests	(20)	(15)
Tax settlement with Marathon Oil Corporation	0	39
Contingent consideration payment	(172)	0
All other, net	18	15
Net cash provided by (used in) financing activities	864	(2,641)
Net decrease in cash and cash equivalents	(438)	(2,842)
Cash and cash equivalents at beginning of period	2,292	4,860
Cash and cash equivalents at end of period	$ 1,854	$ 2,018