Ventures and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Cash and cash equivalents		$ 988	$ 780	$ 1,064	$ 984
Property, plant and equipment		3,771	3,733
Other assets		372	377
Total assets		8,988	8,818
Trade payables		736	757
Current liabilities		1,268	1,338
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents		1	1
Property, plant and equipment		716	535
Other assets		38	24
Total assets	[1]	755	560
Trade payables		2	0
Current liabilities	[2]	24	40
Long-term debt		6	0
Total liabilities		32	40
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Property, plant and equipment		90	96
Trade payables		49	43
Current installments of long-term debt		9	9
Long-term debt		120	125
Total liabilities		178	177
Maximum exposure to loss		$ 315	$ 291

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

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