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Debt Debt (Revolving Credit Facility) (Details)
Jan. 17, 2017
USD ($)
Jun. 30, 2020
USD ($)
May 19, 2020
EUR (€)
Line of Credit Facility      
Goodwill, Gross   $ 3,200,000,000  
Maximum capitalization ratio allowed by debt agreements   60.00%  
Line of Credit | Revolving credit facility      
Line of Credit Facility      
Maximum borrowing capacity $ 2,500,000,000   € 500,000,000
Conditional Increase In Maximum Borrowing Capacity Under Line Of Credit Facility 500,000,000.0    
Line of Credit | JPMorgan Chase Bank [Member] | Letter of Credit [Member]      
Line of Credit Facility      
Maximum borrowing capacity $ 1,500,000,000    
Federal Funds Rate and Overnight Bank Funding Rate spread [Member] | Revolving credit facility      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
London Interbank Offered Rate (LIBOR) [Member] | Revolving credit facility      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Minimum [Member] | LIBOR and EURIBOR Loans [Member] | Revolving credit facility      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 0.82%    
Minimum [Member] | Base Rate [Member] | Revolving credit facility      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 0.00%    
Maximum [Member] | LIBOR and EURIBOR Loans [Member] | Revolving credit facility      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 1.30%    
Maximum [Member] | Base Rate [Member] | Revolving credit facility      
Line of Credit Facility      
Debt Instrument, Basis Spread on Variable Rate 0.30%