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Derivative Instruments (Forward Currency Exchange Contracts) (Details)
€ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Jul. 31, 2019
USD ($)
Nov. 30, 2018
EUR (€)
Foreign Exchange Contract          
Derivative [Line Items]          
Notional Amount $ 7,099 $ 8,088      
Maximum term in days 1464 days 1646 days      
Derivative, Fair Value, Net $ 20 $ 203      
Foreign Exchange Contract | Other current assets          
Derivative [Line Items]          
Derivative assets 24 185      
Foreign Exchange Contract | Other noncurrent assets          
Derivative [Line Items]          
Derivative assets 86 41      
Foreign Exchange Contract | Other current liabilities          
Derivative [Line Items]          
Derivative liabilities (90) (21)      
Foreign Exchange Contract | Other noncurrent liabilities          
Derivative [Line Items]          
Derivative liabilities 0 (2)      
Foreign Exchange Contract | Net Investment          
Derivative [Line Items]          
Notional Amount 639 1,113 € 2,400 $ 1,000 € 2,250
Derivative, Fair Value, Net 8 40      
Foreign Exchange Contract | Net Investment | Other current assets          
Derivative [Line Items]          
Derivative assets 9 0      
Foreign Exchange Contract | Net Investment | Other noncurrent assets          
Derivative [Line Items]          
Derivative assets 1 40      
Foreign Exchange Contract | Net Investment | Other current liabilities          
Derivative [Line Items]          
Derivative liabilities (2) 0      
Foreign Exchange Contract | Net Investment | Other noncurrent liabilities          
Derivative [Line Items]          
Derivative liabilities 0 0      
Foreign Exchange Contract | Non-Designated          
Derivative [Line Items]          
Notional Amount 5,336 6,174      
Derivative, Fair Value, Net (73) 169      
Foreign Exchange Contract | Non-Designated | Other current assets          
Derivative [Line Items]          
Derivative assets 15 180      
Foreign Exchange Contract | Non-Designated | Other noncurrent assets          
Derivative [Line Items]          
Derivative assets 0 0      
Foreign Exchange Contract | Non-Designated | Other current liabilities          
Derivative [Line Items]          
Derivative liabilities (88) (11)      
Foreign Exchange Contract | Non-Designated | Other noncurrent liabilities          
Derivative [Line Items]          
Derivative liabilities 0 0      
Cash Flow Hedging [Member] | Foreign Exchange Contract | Net Investment          
Derivative [Line Items]          
Notional Amount   801      
Derivative, Fair Value, Net   (6)      
Cash Flow Hedging [Member] | Foreign Exchange Contract | Net Investment | Other current assets          
Derivative [Line Items]          
Derivative assets   5      
Cash Flow Hedging [Member] | Foreign Exchange Contract | Net Investment | Other noncurrent assets          
Derivative [Line Items]          
Derivative assets   1      
Cash Flow Hedging [Member] | Foreign Exchange Contract | Net Investment | Other current liabilities          
Derivative [Line Items]          
Derivative liabilities   (10)      
Cash Flow Hedging [Member] | Foreign Exchange Contract | Net Investment | Other noncurrent liabilities          
Derivative [Line Items]          
Derivative liabilities   $ (2)      
Net Investment Hedging [Member] | Net Investment          
Derivative [Line Items]          
Notional Amount 1,124        
Derivative, Fair Value, Net 85        
Net Investment Hedging [Member] | Net Investment | Other current assets          
Derivative [Line Items]          
Derivative assets 0        
Net Investment Hedging [Member] | Net Investment | Other noncurrent assets          
Derivative [Line Items]          
Derivative assets 85        
Net Investment Hedging [Member] | Net Investment | Other current liabilities          
Derivative [Line Items]          
Derivative liabilities 0        
Net Investment Hedging [Member] | Net Investment | Other noncurrent liabilities          
Derivative [Line Items]          
Derivative liabilities $ 0