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Accumulated Other Comprehensive Income - Component of Accumulated Other Comprehensive Income (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss), tax $ 5 $ (4) $ (2) $ 6
Derivative Instruments [Member]
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss), tax     (2)  
Amounts reclassified from accumulated other comprehensive income, tax     1  
Available-for-Sale Securities [Member]
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss), tax     4  
Amounts reclassified from accumulated other comprehensive income, tax     0  
Foreign Currency Translation Adjustments [Member]
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss), tax     0  
Amounts reclassified from accumulated other comprehensive income, tax     0  
Post - Retirement Benefit Plans [Member]
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss), tax     0  
Amounts reclassified from accumulated other comprehensive income, tax     $ 0