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Derivative and Other Financial Instruments (Net Investment Hedge Narrative) (Details)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
EUR (€)
Nov. 30, 2018
EUR (€)
Jan. 31, 2018
USD ($)
Jan. 31, 2018
EUR (€)
Derivative [Line Items]              
Gain (loss), recognized in OCI   $ 47 $ (153)        
Gain (loss) on net investment hedge, net of tax   43 (134)        
Carrying amount of hedged net investment   1,296   € 1,131      
Gain (loss) on net investment hedge $ 19            
Proceeds from settlement of derivative reflected in cash provided by investing activities   15          
Foreign exchange              
Derivative [Line Items]              
Gain (loss), recognized in OCI   $ 11 0        
Derivative fixed rate 4.75%       4.75%    
Derivative,notional amount $ 875       € 768    
Accumulated Other Comprehensive Loss              
Derivative [Line Items]              
Gain (loss), recognized in OCI     (59)        
Gain (loss) on net investment hedge, net of tax     $ (36)        
Net Investment Hedging | Cross Currency Interest Rate Contract              
Derivative [Line Items]              
Derivative,notional amount           $ 875 € 718
Net Investment Hedging | Cross Currency Interest Rate Contract On U.S. Notional Amount              
Derivative [Line Items]              
Derivative fixed rate           4.75% 4.75%
Net Investment Hedging | Cross Currency Interest Rate Contract On Euro Notional Amount              
Derivative [Line Items]              
Derivative fixed rate 1.84%       1.84% 2.50% 2.50%