Ventures and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 1,064		$ 984	$ 1,107	$ 959
Property, plant and equipment, net	3,577		3,425
Other assets	332		341
Total assets	9,333		9,018
Trade payables	839		799
Current liabilities	1,543		1,545
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	44
Property, plant and equipment, net	252
Other assets	24
Total assets	320	[1]
Current liabilities	28
Total liabilities	28	[2]
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Property, plant and equipment, net	102		111
Trade payables	54		56
Current installments of long-term debt	9		8
Long-term debt	128		136
Total liabilities	191		200
Maximum exposure to loss	$ 309		$ 318

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

[2] Represents amounts owed by Fairway for reimbursement of expenditures.