Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current Assets    
Cash and cash equivalents $ 1,510 $ 984
Allowance for doubtful accounts - trade receivables 9 9
Accumulated depreciation 1,785 1,672
Property, plant and equipment 3,618 3,425
Other assets 365 341
Finite-Lived Intangible Assets, Accumulated Amortization 567 588
Stockholders' Equity    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 100,000,000 100,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Treasury stock, shares 12,443,438 8,928,137
Common stock, par value $ 0.0001  
Series A common stock, $0.0001 par value, 400,000,000 shares authorized (2014: 166,075,904 issued and 153,632,466 outstanding; 2013: 165,867,965 issued and 156,939,828 outstanding)
    
Stockholders' Equity    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 166,075,904 165,867,965
Common stock, shares outstanding 153,632,466 156,939,828
Series B common stock, $0.0001 par value, 100,000,000 shares authorized (2014 and 2013: 0 issued and outstanding)
    
Stockholders' Equity    
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 0 0
Common stock, shares outstanding 0 0
Variable Interest Entity, Primary Beneficiary [Member]
    
Current Assets    
Cash and cash equivalents 6  
Property, plant and equipment 388  
Other assets $ 24 [1]  
[1] Includes prepaid intangible assets with a weighted average amortization period of 28 years.