Income Taxes (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income from Continuing Operations Before Income Tax Expense from Domestic and Foreign Operations
U.S. operations		$ 1,733	$ 5,327	$ 4,677
International operations		1,449	644	875
Income from continuing operations before income tax expense		3,182	5,971	5,552
Reconciliation of Income Tax Expense Related to Income from Continuing Operations Before Income Tax Expense
Income tax expense at statutory rates		862	1,956	1,782
U.S. state and Canadian provincial tax expense, net of federal income tax effect		36	118	133
Permanent differences:
Manufacturing deduction		(22)	(102)	(74)
Other		(13)	(23)	(15)
Change in tax law		(7)	(17)
Tax effects of income associated with noncontrolling interests		(44)	(39)	(28)
Other, net		(47)	(23)	(21)
Income tax expense		765	1,870	1,777
Current:
Country		488	1,577	1,249
U.S. state / Canadian provincial		47	128	83
Total current		535	1,705	1,332
Deferred:
Country		238	151	362
U.S. state / Canadian provincial		(8)	14	83
Total deferred		230	165	445
Income tax expense		765	1,870	1,777
Income Taxes Paid
Income taxes paid, net		444	2,093	1,624
Deferred income tax assets:
Tax credit carryforwards					$ 65	$ 33
Net operating losses (NOLs)					374	423
Inventories					93	72
Compensation and employee benefit liabilities					344	331
Environmental liabilities					69	80
Other					100	139
Total deferred income tax assets					1,045	1,078
Less: Valuation allowance					(374)	(435)
Net deferred income tax assets					671	643
Deferred income tax liabilities:
Property, plant, and equipment					6,900	6,725
Deferred turnaround costs					450	394
Inventories					356	287
Investments					253	226
Other					73	71
Total deferred income tax liabilities					8,032	7,703
Net deferred income tax liabilities					7,361	7,060
Reconciliation of the Change in Unrecognized Tax Benefits
Balance as of beginning of year		964	989	950
Additions based on tax positions related to the current year		36	36	35
Additions for tax positions related to prior years		11	83	118
Reductions for tax positions related to prior years		(46)	(82)	(67)
Reductions for tax positions related to the lapse of applicable statute of limitations		(3)	(3)	(1)
Settlements		(237)	(59)	(46)
Reclassification of uncertain tax receivable to long-term receivable from IRS		211	0	0
Balance as of end of year		936	964	989
Reconciliation of Unrecognized Tax Benefits to Uncertain Tax Position Liabilities
Unrecognized tax benefits		964	989	950	936	964	$ 989	$ 950
Tax refund claim not presented in our balance sheets					(433)	(570)
Other					(5)	25
Uncertain tax position liabilities presented in our balance sheets					498	419
Amounts Recognized in Balance Sheets for Uncertain Tax Positions
Liability for uncertain tax positions, noncurrent					(465)	(148)
Uncertain tax position liabilities presented in our balance sheets					(498)	(419)
Income Taxes (Textual)
Income tax benefit related to discontinued operations				0
Decrease in valuation allowance		61
Cumulative undistributed earnings of foreign subsidiaries					3,900
Cash and temporary cash investments					4,816	4,114	$ 3,689	$ 4,292
Tax refund claim included in unrecognized tax benefits					433	570
Income tax benefits if recognized that would impact the effective tax rate					756	757
Interest expense and penalties accrued					70	117
Possible reduction to unrecognized tax benefit					4
Deferred Charges and Other Assets, net [Member]
Amounts Recognized in Balance Sheets for Uncertain Tax Positions
Uncertain tax receivable					0	195
Income Taxes Payable [Member]
Amounts Recognized in Balance Sheets for Uncertain Tax Positions
Liability for uncertain tax positions, current					(7)	(438)
Other Noncurrent Liabilities [Member]
Amounts Recognized in Balance Sheets for Uncertain Tax Positions
Liability for uncertain tax positions, noncurrent					(465)	(148)
Deferred Income Taxes [Member]
Amounts Recognized in Balance Sheets for Uncertain Tax Positions
Liability for uncertain tax positions, noncurrent					(26)	$ (28)
Domestic Tax Authority [Member]
Reconciliation of Income Tax Expense Related to Income from Continuing Operations Before Income Tax Expense
Income tax expense at statutory rates		606	1,864	1,637
U.S. state and Canadian provincial tax expense, net of federal income tax effect		5	45	62
Permanent differences:
Manufacturing deduction		(22)	(102)	(74)
Other		(3)	(18)	(16)
Change in tax law		0	0
Tax effects of income associated with noncontrolling interests		(44)	(39)	(28)
Other, net		(37)	(25)	(22)
Income tax expense		505	1,725	1,559
Current:
Country		294	1,513	1,196
U.S. state / Canadian provincial		12	85	59
Total current		306	1,598	1,255
Deferred:
Country		203	143	268
U.S. state / Canadian provincial		(4)	(16)	36
Total deferred		199	127	304
Income tax expense		505	1,725	1,559
Income Taxes Paid
Income taxes paid, net		241	2,092	1,455
Income Tax Credit and Loss Carryforwards
U.S. alternative minimum tax credit					18
Foreign Tax Authority [Member]
Reconciliation of Income Tax Expense Related to Income from Continuing Operations Before Income Tax Expense
Income tax expense at statutory rates		256	92	145
U.S. state and Canadian provincial tax expense, net of federal income tax effect		31	73	71
Permanent differences:
Manufacturing deduction		0	0	0
Other		(10)	(5)	1
Change in tax law		(7)	(17)
Tax effects of income associated with noncontrolling interests		0	0	0
Other, net		(10)	2	1
Income tax expense		260	145	218
Current:
Country		194	64	53
U.S. state / Canadian provincial		35	43	24
Total current		229	107	77
Deferred:
Country		35	8	94
U.S. state / Canadian provincial		(4)	30	47
Total deferred		31	38	141
Income tax expense		260	145	218
Income Taxes Paid
Income taxes paid, net		$ 203	$ 1	$ 169
State and Local Jurisdiction [Member]
Income Tax Credit and Loss Carryforwards
U.S. state NOLs (gross amount)					9,018
State and Local Jurisdiction [Member] | Minimum [Member]
Income Tax Credit and Loss Carryforwards
NOL, expiration		Dec. 31, 2017
State and Local Jurisdiction [Member] | Maximum [Member]
Income Tax Credit and Loss Carryforwards
NOL, expiration		Dec. 31, 2036
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member]
Income Tax Credit and Loss Carryforwards
U.S. state income tax credits					71
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member] | Minimum [Member]
Income Tax Credit and Loss Carryforwards
Income tax credits, expiration		Dec. 31, 2017
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member] | Maximum [Member]
Income Tax Credit and Loss Carryforwards
Income tax credits, expiration		Dec. 31, 2026
State and Local Jurisdiction [Member] | U S State Income Tax Credits Unlimited [Member]
Income Tax Credit and Loss Carryforwards
U.S. state income tax credits					2
U.S. [Member]
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense
Applicable statutory income tax rate		35.00%	35.00%	35.00%
Non-US [Member]
Income Taxes (Textual)
Cash and temporary cash investments					$ 2,200
Canada [Member]
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense
Applicable statutory income tax rate		15.00%	15.00%	15.00%
U.K. [Member]
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense
Applicable statutory income tax rate		20.00%	20.00%	21.00%
Ireland [Member]
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense
Applicable statutory income tax rate		13.00%	13.00%	13.00%
Aruba [Member]
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense
Applicable statutory income tax rate	[1]	7.00%	7.00%	7.00%

[1] Statutory income tax rate applicable through the date of the Aruba Disposition as described in Note 2.