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Derivative Instruments (Forward Currency Exchange Contracts) (Details) - Foreign Exchange Contract
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2021
EUR (€)
Derivative [Line Items]      
Notional Amount $ 8,588 $ 8,159  
Maximum term in days 1703 days 1793 days  
Derivative, Fair Value, Net $ 85 $ (140)  
Other current assets      
Derivative [Line Items]      
Derivative assets 94 16  
Other noncurrent assets      
Derivative [Line Items]      
Derivative assets 33 4  
Other current liabilities      
Derivative [Line Items]      
Derivative liabilities (34) (133)  
Other noncurrent liabilities      
Derivative [Line Items]      
Derivative liabilities (8) (27)  
Net Investment      
Derivative [Line Items]      
Notional Amount | €     € 4,350
Non-Designated      
Derivative [Line Items]      
Notional Amount 5,894 5,382  
Derivative, Fair Value, Net 74 (114)  
Non-Designated | Other current assets      
Derivative [Line Items]      
Derivative assets 87 7  
Non-Designated | Other noncurrent assets      
Derivative [Line Items]      
Derivative assets 0 0  
Non-Designated | Other current liabilities      
Derivative [Line Items]      
Derivative liabilities (13) (121)  
Non-Designated | Other noncurrent liabilities      
Derivative [Line Items]      
Derivative liabilities 0 0  
Cash Flow | Net Investment      
Derivative [Line Items]      
Notional Amount 927 949  
Derivative, Fair Value, Net (14) (4)  
Cash Flow | Net Investment | Other current assets      
Derivative [Line Items]      
Derivative assets 7 9  
Cash Flow | Net Investment | Other noncurrent assets      
Derivative [Line Items]      
Derivative assets 1 0  
Cash Flow | Net Investment | Other current liabilities      
Derivative [Line Items]      
Derivative liabilities (21) (12)  
Cash Flow | Net Investment | Other noncurrent liabilities      
Derivative [Line Items]      
Derivative liabilities (1) (1)  
Net Investment | Net Investment      
Derivative [Line Items]      
Notional Amount 1,767 1,828  
Derivative, Fair Value, Net 25 (22)  
Net Investment | Net Investment | Other current assets      
Derivative [Line Items]      
Derivative assets 0 0  
Net Investment | Net Investment | Other noncurrent assets      
Derivative [Line Items]      
Derivative assets 32 4  
Net Investment | Net Investment | Other current liabilities      
Derivative [Line Items]      
Derivative liabilities 0 0  
Net Investment | Net Investment | Other noncurrent liabilities      
Derivative [Line Items]      
Derivative liabilities $ (7) $ (26)