Ventures and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 998		$ 984	$ 978	$ 959
Property, plant and equipment, net	3,519		3,425
Other assets	332		341
Total assets	9,129		9,018
Trade payables	790		799
Current liabilities	1,510		1,545
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	33
Property, plant and equipment, net	174
Other assets	24
Total assets	231	[1]
Current liabilities	16
Total liabilities	16	[2]
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Property, plant and equipment, net	105		111
Trade payables	45		49
Current installments of long-term debt	8		8
Long-term debt	130		136
Total liabilities	183		193
Maximum exposure to loss	$ 306		$ 311

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

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