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Derivative Instruments (Forward Currency Exchange Contracts) (Details)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 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   $ 7,612 $ 8,088      
Maximum term in days 1646 days 1372 days        
Derivative, Fair Value, Net   $ (38) 203      
Foreign Exchange Contract | Other current assets            
Derivative [Line Items]            
Derivative assets   23 185      
Foreign Exchange Contract | Other noncurrent assets            
Derivative [Line Items]            
Derivative assets   44 41      
Foreign Exchange Contract | Other current liabilities            
Derivative [Line Items]            
Derivative liabilities   (103) (21)      
Foreign Exchange Contract | Other noncurrent liabilities            
Derivative [Line Items]            
Derivative liabilities   (2) (2)      
Foreign Exchange Contract | Net Investment            
Derivative [Line Items]            
Notional Amount   824 1,113 € 2,400 $ 1,000 € 2,250
Derivative, Fair Value, Net   3 40      
Foreign Exchange Contract | Net Investment | Other current assets            
Derivative [Line Items]            
Derivative assets   10 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   (6) 0      
Foreign Exchange Contract | Net Investment | Other noncurrent liabilities            
Derivative [Line Items]            
Derivative liabilities   (2) 0      
Foreign Exchange Contract | Non-Designated            
Derivative [Line Items]            
Notional Amount   5,619 6,174      
Derivative, Fair Value, Net   (84) 169      
Foreign Exchange Contract | Non-Designated | Other current assets            
Derivative [Line Items]            
Derivative assets   13 180      
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   (97) (11)      
Foreign Exchange Contract | Non-Designated | Other noncurrent liabilities            
Derivative [Line Items]            
Derivative liabilities   0 0      
Cash Flow | Foreign Exchange Contract | Net Investment            
Derivative [Line Items]            
Notional Amount     801      
Derivative, Fair Value, Net     (6)      
Cash Flow | Foreign Exchange Contract | Net Investment | Other current assets            
Derivative [Line Items]            
Derivative assets     5      
Cash Flow | Foreign Exchange Contract | Net Investment | Other noncurrent assets            
Derivative [Line Items]            
Derivative assets     1      
Cash Flow | Foreign Exchange Contract | Net Investment | Other current liabilities            
Derivative [Line Items]            
Derivative liabilities     (10)      
Cash Flow | Foreign Exchange Contract | Net Investment | Other noncurrent liabilities            
Derivative [Line Items]            
Derivative liabilities     $ (2)      
Net Investment | Net Investment            
Derivative [Line Items]            
Notional Amount   1,169        
Derivative, Fair Value, Net   43        
Net Investment | Net Investment | Other current assets            
Derivative [Line Items]            
Derivative assets   0        
Net Investment | Net Investment | Other noncurrent assets            
Derivative [Line Items]            
Derivative assets   43        
Net Investment | Net Investment | Other current liabilities            
Derivative [Line Items]            
Derivative liabilities   0        
Net Investment | Net Investment | Other noncurrent liabilities            
Derivative [Line Items]            
Derivative liabilities   $ 0