Ventures and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2014
Variable Interest Entity, Primary Beneficiary [Member]
Sep. 30, 2014
Variable Interest Entity, Not Primary Beneficiary [Member]
Dec. 31, 2013
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life         28 years    
Cash and cash equivalents $ 1,510 $ 984 $ 1,100 $ 959 $ 6    
Property, plant and equipment 3,618 3,425     388 101 111
Other assets 365 341     24 [1]    
Total assets 9,710 9,018     418 [2]    
Trade payables 816 799       45 56
Current installments of long-term debt           9 8
Current liabilities 2,189 1,545     37    
Long-term debt           128 136
Total liabilities         37 [3] 182 200
Maximum exposure to loss           $ 300 $ 318
[1] Includes prepaid intangible assets with a weighted average amortization period of 28 years.
[2] Assets can only be used to settle the obligations of Fairway.
[3] Represents amounts owed by Fairway for reimbursement of expenditures.