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Derivative Instruments (Narrative) (Details)
€ in Millions, $ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Jul. 26, 2019
USD ($)
Dec. 31, 2018
USD ($)
Document Period End Date Sep. 30, 2019      
Foreign Exchange Contract        
Derivative, Notional Amount $ 7,778     $ 6,336
Designated as Hedging Instrument | Foreign Exchange Contract        
Derivative, fair value 61      
Cash flow hedge gain (loss) to be reclassified within twelve months (3)      
Other Income 25      
Derivative, Notional Amount 804   $ 1,000 870
Designated as Hedging Instrument | Interest Rate Swap [Member]        
Derivative, Notional Amount 750 € 600    
Net Investment Hedging [Member] | Foreign Exchange Contract        
Derivative, Notional Amount 2,250      
Net Investment Hedging [Member] | Designated as Hedging Instrument        
Derivative, Notional Amount 1,100     $ 0
Accrued Expenses | Designated as Hedging Instrument | Interest Rate Swap [Member]        
Derivative Assets (Liabilities), at Fair Value, Net (6)      
Other noncurrent liabilities | Designated as Hedging Instrument | Interest Rate Swap [Member]        
Derivative Assets (Liabilities), at Fair Value, Net $ (8)