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Short-Term Borrowings and Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Revolving Credit Facility [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Interest Rate at Period End 0.80%  
Revolving Credit Facility [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Interest Rate at Period End 0.90%  
Five year $4.4 billion credit facility [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit, Credit Facility, Maximum Borrowing Capacity $ 4,400  
Line of Credit Facility, Expiration Period 5 years  
Three year $4.4 billion credit facility [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit, Credit Facility, Maximum Borrowing Capacity $ 4,400  
Line of Credit Facility, Expiration Period 3 years  
364 day $3.8 billion credit facility [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit, Credit Facility, Maximum Borrowing Capacity $ 3,800  
Line of Credit Facility, Expiration Period 364 days  
Subsidiaries [Member]    
Debt Instrument [Line Items]    
Other Long-term Debt $ 1,200 $ 1,200
Other Long-term Debt, Current $ 359 $ 354
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Short-term Debt, Weighted Average Interest Rate, at Point in Time 0.20%