v2.4.0.6
Goodwill and Other Intangible Assets Intangible Assets Future Amortization Expense (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite lived intangible assets future amortization expense [Line Items]            
2012           $ 186
2013         420  
2014       413    
2015     409      
2016   405        
2017 $ 402