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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, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
May 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
CNY (¥)
Jun. 30, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Jun. 30, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Sep. 15, 2016
EUR (€)
Mar. 31, 2016
CNY (¥)
Mar. 10, 2015
EUR (€)
Derivative [Line Items]                                            
Settlement of derivatives $ 4 $ 10                   $ 2 $ 28 $ 1                
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                       67 (177) 67                
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                         (177)                  
Net investment hedge gains (losses) included in accumulated other comprehensive income     $ (117)         $ (117)         (117)                  
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                       67                    
Net investment hedge gains (losses) included in accumulated other comprehensive income (50)         $ (50)           (50)                    
Foreign Exchange Forward [Member] | China, Yuan Renminbi | Net Investment Hedging | Designated as Hedging Instrument                                            
Derivative [Line Items]                                            
Notional amount of derivative $ 85 $ 75 290 $ 345   $ 85 $ 75 $ 290 $ 345 $ 265 $ 370 $ 85 $ 290 $ 265 ¥ 0.6 ¥ 0.5 ¥ 1.9 ¥ 2.4 ¥ 1.8   ¥ 2.4  
Derivative, Maturity Date           Mar. 29, 2019 Dec. 20, 2018 Jun. 20, 2018 Dec. 21, 2017 Jun. 21, 2017 May 31, 2016                      
Settlement of derivatives     $ 16 $ 12 $ 1