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Goodwill and Other Intangible Assets Intangible Assets Future Amortization Expense (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite lived intangible assets future amortization expense [Line Items]            
2013           $ 432
2014         428  
2015       422    
2016     410      
2017   399        
2018 $ 379