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Derivatives And Hedging Activities Net Investment Hedges (Details)
€ in Millions, ¥ in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Jun. 30, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Sep. 15, 2016
EUR (€)
Mar. 10, 2015
EUR (€)
Derivative [Line Items]                                  
Settlement of derivatives                   $ 6 $ 12            
Net Investment Hedging | Designated as Hedging Instrument                                  
Derivative [Line Items]                                  
Gain (loss) on net investment hedge, net of tax       $ (22)     $ (44)     31 (147)            
Net Investment Hedging | Designated as Hedging Instrument | Euro-Denominated Senior Notes, 1.500% Due 2025 | Senior Notes                                  
Derivative [Line Items]                                  
Debt instrument designated as net investment hedge | €                                 € 700
Net Investment Hedging | Designated as Hedging Instrument | Euro-denominated Senior Notes, 1.600% Due 2028 | Senior Notes                                  
Derivative [Line Items]                                  
Debt instrument designated as net investment hedge | €                               € 500  
Net Investment Hedging | Designated as Hedging Instrument | Euro-Denominated Senior Notes, 1.500% Due 2025 and Euro-Denominated Senior Notes, 1.600% Due 2028 | Senior Notes                                  
Derivative [Line Items]                                  
Gain (loss) on net investment hedge, net of tax       (22)     $ (44)     31 $ (147)            
Net investment hedge gains (losses) included in accumulated other comprehensive income   $ (117)   $ (86)   $ (117)       (86)              
Amount of ineffectiveness on net investment hedges                   $ 0              
Foreign exchange forward | China, Yuan Renminbi | Net Investment Hedging | Designated as Hedging Instrument                                  
Derivative [Line Items]                                  
Notional amount of derivative $ 75 290 $ 345   $ 75 $ 290   $ 345 $ 265     ¥ 486 ¥ 1,900 ¥ 2,400 ¥ 1,800    
Derivative, Maturity Date         Dec. 20, 2018 Jun. 20, 2018   Dec. 21, 2017 Jun. 21, 2017                
Settlement of derivatives $ 10 $ 16 $ 12