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Derivatives and Hedging - Interest Rate Management Risk Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative [Line Items]        
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months $ 8   $ 8  
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]        
Derivative [Line Items]        
Derivative loss $ 15 $ 11 $ 6 $ 13
Cash Flow Hedging [Member]        
Derivative [Line Items]        
Interest rate fluctuations, maximum hedging period (up to)     2 years