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Debt (Narrative) (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Aug. 01, 2018
Extension
Debt Instrument [Line Items]        
Short-term borrowings $ 3,000,000,000.0   $ 0  
Face amount     0  
Debt instrument, covenant, consolidated EBITDA to interest expense ratio, minimum 4.0      
Debt instrument, consolidated EBITDA to interest expense ratio 9.0      
Interest payable, short-term borrowings $ 1,000,000      
Long-term debt repaid 1,000,000,000 $ 0    
Accrued interest on long-term debt 270,000,000   $ 470,000,000  
Senior Notes [Member]        
Debt Instrument [Line Items]        
Long-term debt repaid $ 1,000,000,000      
Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2023 [Member]        
Debt Instrument [Line Items]        
Debt instrument, number of extensions | Extension       2
Debt instrument, expected repayment period 1 year      
Debt instrument, extension term 1 year      
Debt instrument, interest rate during period 2.23%      
Line of Credit [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility Due August 2023 [Member]        
Debt Instrument [Line Items]        
Face amount $ 3,000,000,000.0      
Debt instrument, term 5 years      
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility Due August 2023 [Member]        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 1.00%