Taxes (Details 1) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred tax liabilities
Properties, plant and equipment	$ 27,044	$ 28,452
Investments and other	3,743	3,059
Total deferred tax liabilities	30,787	31,511
Deferred tax assets
Foreign tax credits	(10,534)	(11,867)
Abandonment/environmental reserves	(6,880)	(6,686)
Employee benefits	(4,801)	(4,831)
Deferred credits	(1,810)	(1,828)
Tax loss carryforwards	(2,748)	(1,747)
Other accrued liabilities	(525)	(498)
Inventory	(120)	(153)
Miscellaneous	(2,525)	(2,128)
Total deferred tax assets	(29,943)	(29,738)
Deferred tax assets valuation allowance	15,412	16,292
Total deferred taxes, net	16,256	18,065
Classification of deferred taxes
Prepaid expenses and other current assets	(917)	(1,071)
Deferred charges and other assets	(4,512)	(3,597)
Federal and other taxes on income	996	813
Noncurrent deferred income taxes	20,689	21,920
Total deferred taxes, net	$ 16,256	$ 18,065