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Derivatives And Hedging Activities Net Investment Hedges (Details)
€ in Millions, $ in Millions, ¥ in Billions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
May 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
CNY (¥)
Sep. 30, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Sep. 15, 2016
EUR (€)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
CNY (¥)
Mar. 10, 2015
EUR (€)
Derivative [Line Items]                                  
Settlement of derivatives               $ 28 $ 1 $ 0              
Amount of Ineffectiveness on Net Investment Hedge               0                  
Net Investment Hedging | Designated as Hedging Instrument                                  
Derivative [Line Items]                                  
Gain (loss) on Net Investment Hedge, net of tax               (177) 67 $ (5)              
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
Gain (loss) on Net Investment Hedge, net of tax                 65                
Net investment hedge gains (losses) included in accumulated other comprehensive income             $ 60   60                
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               (177)                  
Net investment hedge gains (losses) included in accumulated other comprehensive income $ (117)     $ (117)       (117)                  
Foreign exchange forward | China, Yuan Renminbi | Net Investment Hedging | Designated as Hedging Instrument                                  
Derivative [Line Items]                                  
Notional amount of derivative 290     $ 290 $ 345   $ 265 $ 290 $ 265   ¥ 1.9 ¥ 2.4 ¥ 1.8   $ 370 ¥ 2.4  
Derivative, Maturity Date       Jun. 20, 2018 Dec. 21, 2017 May 31, 2016 Jun. 21, 2017                    
Settlement of derivatives $ 16 $ 12 $ 1