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Derivatives and Hedging Instruments - Derivative Fair Values (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
currency
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Currency Exposure, Number of Functional Currencies 50  
Maximum Period For Cash Flow Hedging Activity 0 years 15 months  
Derivative Assets, Fair Value $ 2 $ 2
Derivative Liabilities, Fair Value 11 11
Interest Rate Swap Ending Notional 341  
Derivatives designated as hedging instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair Value 1 1
Derivative Liabilities, Fair Value 10 10
Derivatives not designated as hedging instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Assets, Fair Value 1 1
Derivative Liabilities, Fair Value 1 1
Interest Rate Swap [Member]
   
Derivatives, Fair Value [Line Items]    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax 5  
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Other current assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 0 0
Derivative Assets, Fair Value 0 0
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Other current liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities, Fair Value 4 3
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Other current liabilities and other liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 490 518
Derivative Liabilities, Fair Value 9 10
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Other noncurrent liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liabilities, Fair Value 5 7
Foreign Exchange Derivative [Member]
   
Derivatives, Fair Value [Line Items]    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax 0  
Foreign Exchange Derivative [Member] | Derivatives designated as hedging instrument [Member] | Other current assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 63 103
Derivative Assets, Fair Value 1 1
Foreign Exchange Derivative [Member] | Derivatives designated as hedging instrument [Member] | Other current liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 30 0
Derivative Liabilities, Fair Value 1 0
Foreign Exchange Derivative [Member] | Derivatives not designated as hedging instrument [Member] | Other current assets [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 131 162
Derivative Assets, Fair Value 1 1
Foreign Exchange Derivative [Member] | Derivatives not designated as hedging instrument [Member] | Other current liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative Liability, Notional Amount 239 158
Derivative Liabilities, Fair Value $ 1 $ 1