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Derivative Instruments (Narrative) (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
EUR (€)
Jul. 31, 2019
USD ($)
Nov. 30, 2018
EUR (€)
Foreign Exchange Contract              
Notional amount $ 7,206     $ 8,088      
Designated as Hedging Instrument | Foreign Exchange Contract              
Notional amount 837   € 2,400 $ 1,113   $ 1,000 € 2,250
Derivative, fair value 83            
Cash flow hedge gain (loss) to be reclassified within twelve months 26            
Other Income 27            
Designated as Hedging Instrument | Interest Rate Swap              
Notional amount 750            
Cash flow hedge gain (loss) to be reclassified within twelve months   $ 6          
Notional amount terminated | €         € 600    
Net Investment Hedging [Member] | Designated as Hedging Instrument              
Notional amount 1,094            
Accrued Expenses | Designated as Hedging Instrument | Interest Rate Swap              
Pretax losses recorded in AOCI $ 62