Taxes (Details 1) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income (loss) before income taxes
United States		$ (4,317)	$ (2,877)	$ 6,296
International		2,157	7,719	24,906
Income (Loss) Before Income Tax Expense		(2,160)	4,842	31,202
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Theoretical tax (at U.S. statutory rate of 35%)		(756)	1,695	10,921
Equity affiliate accounting effect		(704)	(1,286)	(2,039)
Effect of income taxes from international operations		608	72	2,708
State and local taxes on income, net of U.S. federal income tax benefit		(44)	(74)	234
Prior year tax adjustments, claims and settlements		(349)	84	(76)
Tax credits		(188)	(35)	(68)
Other		(296)	(324)	212
Total income tax expense (benefit)		$ (1,729)	$ 132	$ 11,892
Effective income tax rate		80.00%	2.70%	38.10%
U.S. statutory tax rate		35.00%
Deferred tax liabilities
Properties, plant and equipment		$ 25,180	$ 27,044
Investments and other		5,222	3,743
Total deferred tax liabilities		30,402	30,787
Deferred tax assets
Foreign tax credits		(10,976)	(10,534)
Abandonment/environmental reserves		(6,251)	(6,880)
Employee benefits		(4,392)	(4,801)
Deferred credits		(1,950)	(1,810)
Tax loss carryforwards		(6,030)	(2,748)
Other accrued liabilities		(510)	(525)
Inventory		(374)	(120)
Miscellaneous		(3,121)	(2,525)
Total deferred tax assets		(33,604)	(29,943)
Deferred tax assets valuation allowance		16,069	15,412
Total deferred taxes, net		12,867	16,256
Classification of deferred taxes
Deferred charges and other assets		(4,649)	(3,909)
Noncurrent deferred income taxes	[1]	17,516	20,165
Total deferred taxes, net		$ 12,867	$ 16,256

[1] 2015 adjusted to conform to ASU 2015-17. Refer to Note 18, "Income Taxes" beginning on page FS-45.