Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ (667)	$ 3,501	$ 2,135
Restructuring Charges	2,177	129	0
Severance Costs	(304)	(28)	0
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation, depletion, and amortization	1,835	2,126	1,900
Environmental Expense and Liabilities	(333)	(569)	1,000
Deferred income tax benefit, continuing operations	(224)	(454)	(132)
Other changes:
Receivables	1,468	(1,381)	(449)
Accounts payable	(603)	489	327
Increase (Decrease) in Inventories	(153)	271	107
Other	(596)	520	(227)
Total cash flows from operating activities	2,906	4,062	4,447
Cash flows from investing activities:
Capital expenditures	(2,184)	(3,283)	(2,934)
Proceeds from Sale of Available-for-sale Securities	106	444
Proceeds from Sale and Maturity of Marketable Securities			356
Purchases of investment securities	(109)	(183)	(329)
Sales of property, plant, and equipment	168	338	241
Payments to acquire businesses, net of cash acquired	(39)	(231)	(94)
Other investing activities	(134)	(223)	(110)
Total cash flows from investing activities	(2,192)	(3,138)	(2,870)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt	7,440	0	2,968
Payments of Ordinary Dividends, Common Stock	614	533	465
Proceeds from Stock Options Exercised	167	332	277
Payments to reacquire common stock	0	(800)	(4,356)
Other financing activities	88	(29)	(178)
Total cash flows from financing activities	7,081	(1,030)	(1,754)
Effect of exchange rate changes on cash	(9)	41	49
Increase (decrease) in cash and equivalents	7,786	(65)	(128)
Cash and equivalents at beginning of year	2,291	2,356	2,484
Cash and equivalents at end of year	10,077	2,291	2,356
Cash payments during the period for:
Interest	380	384	293
Income taxes	$ 370	$ 1,269	$ 913