Ventures and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Cash and cash equivalents		$ 967	$ 780	$ 984	$ 959
Trade receivables - third party and affiliates		706	801
Property, plant and equipment (net of accumulated depreciation - 2015: $10)		3,609	3,733
Accumulated depreciation		2,039	1,816
Intangible assets, net		125	132
Accumulated amortization		528	556	$ 587
Other assets		300	355
Total assets		8,586	8,796
Trade payables		587	757
Current liabilities		1,550	1,338
Deferred income taxes		136	141
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents		7	1
Trade receivables - third party and affiliates		6	0
Property, plant and equipment (net of accumulated depreciation - 2015: $10)		772	530
Intangible assets, net		27	0
Other assets		13	29
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Property, plant and equipment (net of accumulated depreciation - 2015: $10)		73	96
Trade payables		47	43
Current installments of long-term debt		10	9
Long-term debt		109	125
Total liabilities		166	177
Maximum exposure to loss		268	291
Fairway Methanol LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents		7	1
Trade receivables - third party and affiliates		12	0
Property, plant and equipment (net of accumulated depreciation - 2015: $10)		772	530
Accumulated depreciation		10	0
Intangible assets, net		27	0
Accumulated amortization		0	0
Other assets		13	29
Total assets	[1]	831	560
Trade payables		9	0
Current liabilities	[2]	5	40
Long-term debt		5	0
Deferred income taxes		2	0
Total liabilities		$ 21	$ 40

[1] Assets can only be used to settle the obligations of Fairway.

[2] Amounts owed by Fairway to the Company for reimbursement of expenditures.