Ventures and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Cash and cash equivalents		$ 638	$ 967	$ 780	$ 984
Trade receivables - third party and affiliates		801	706
Property, plant and equipment (net of accumulated depreciation - 2016: $50; 2015: $10)		3,577	3,609
Accumulated depreciation		2,239	2,039
Intangible assets, net		194	125
Accumulated amortization		524	528	$ 556
Other assets		307	300
Total assets		8,357	8,586
Trade payables		625	587
Current liabilities		1,077	1,550
Deferred income taxes		130	136
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents		18	7
Trade receivables - third party and affiliates		4	6
Property, plant and equipment (net of accumulated depreciation - 2016: $50; 2015: $10)		734	772
Intangible assets, net		26	27
Other assets		9	13
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Property, plant and equipment (net of accumulated depreciation - 2016: $50; 2015: $10)		60	73
Trade payables		53	47
Current installments of long-term debt		10	10
Long-term debt		91	109
Total liabilities		154	166
Maximum exposure to loss		240	268
Fairway Methanol LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents		18	7
Trade receivables - third party and affiliates		8	12
Property, plant and equipment (net of accumulated depreciation - 2016: $50; 2015: $10)		734	772
Accumulated depreciation		50	10
Intangible assets, net		26	27
Accumulated amortization		1	0
Other assets		9	13
Total assets	[1]	795	831
Trade payables		15	9
Current liabilities	[2]	2	5
Long-term debt		5	5
Deferred income taxes		2	2
Total liabilities		$ 24	$ 21

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

[2] Primarily represents amounts owed by Fairway to the Company for reimbursement of expenditures.