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Debt (Narrative) (Details) - USD ($)
2 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Facility expiration date May 18, 2021      
Commercial paper issued     $ 1,500,000,000  
Commercial paper repaid     $ 1,500,000,000  
Commercial paper maturity duration minimum     14 days  
Commercial paper maturity duration maximum     39 days  
Commercial paper outstanding $ 200,000,000 $ 200,000,000 $ 200,000,000  
Credit available under line of credit 600,000,000 600,000,000 600,000,000  
Amount drawn under line of credit   300,000,000    
Repayments of line of credit   0    
Amount outstanding under line of credit 300,000,000 300,000,000 300,000,000  
Board of Directors authorized debt issuance       $ 6,000,000,000
Board of Directors remaining debt issuance 2,250,000,000 2,250,000,000 2,250,000,000  
Secured debt under receivables securitization facility 400,000,000 400,000,000 400,000,000 $ 400,000,000
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Revolving credit facility available credit 2,000,000,000.0 2,000,000,000.0 $ 2,000,000,000.0  
Facility expiration date     Jun. 08, 2023  
Credit facility term     5 years  
Revolving credit facility withdrawals 0 0 $ 0  
Allowable debt per debt to earnings before interest taxes depreciation and amortization coverage ratio (as defined in the facility)     36,900,000,000  
Outstanding debt (as defined by facility) 29,700,000,000 29,700,000,000 29,700,000,000  
Cross-default provision (as defined by facility) $ 150,000,000 $ 150,000,000 $ 150,000,000