Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income	$ 2,700	$ 1,750
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,233	967
Pension and other postretirement benefits, net	51	123
Deferred income taxes	(6)	(126)
Net gain on disposal of assets	(6)	(14)
Equity method investments, net	8	(39)
Changes in the fair value of derivative instruments	9	(35)
Changes in:
Current receivables	931	424
Inventories	86	(731)
Current accounts payable and accrued liabilities	(1,707)	318
All other, net	(46)	85
Net cash provided by operating activities	3,253	2,722
Investing activities:
Additions to property, plant and equipment	(1,277)	(952)
Acquisitions, net of cash acquired	0	(2,831)
Disposal of assets	14	19
Investments – acquisitions, loans and contributions	(221)	(341)
Investments - redemptions, repayments and return of capital	4	3
All other, net	52	78
Net cash used in investing activities	(1,428)	(4,024)
Financing activities:
Long-term debt – borrowings	528	2,903
Long-term debt – repayments	(433)	(32)
Debt issuance costs	(4)	(19)
Issuance of common stock	29	21
Common stock repurchased	(773)	(1,449)
Dividends paid	(443)	(386)
Distributions to noncontrolling interests	(29)	(20)
Contingent consideration payment	(175)	(172)
All other, net	25	18
Net cash provided by (used in) financing activities	(1,275)	864
Net increase (decrease) in cash and cash equivalents	550	(438)
Cash and cash equivalents at beginning of period	1,494	2,292
Cash and cash equivalents at end of period	$ 2,044	$ 1,854