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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Apr. 07, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Commercial paper issued $ 900,000,000    
Commercial paper repaid $ 900,000,000    
Commercial paper maturity duration minimum 14 days    
Commercial paper maturity duration maximum 36 days    
Commercial paper outstanding $ 200,000,000    
Board of Directors authorized debt issuance     $ 6,000,000,000
Board of Directors remaining debt issuance 3,000,000,000.0    
Secured debt under receivables securitization facility 400,000,000   $ 400,000,000
Subsequent Event [Member]      
Debt Instrument [Line Items]      
Board of Directors remaining debt issuance   $ 2,250,000,000  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit facility available credit $ 2,000,000,000.0    
Facility expiration date Jun. 08, 2023    
Credit facility term 5 years    
Revolving credit facility withdrawals $ 0    
Allowable debt per debt to earnings before interest taxes depreciation and amortization coverage ratio (as defined in the facility) 39,000,000,000.0    
Outstanding debt (as defined by facility) 29,100,000,000    
Cross-default provision (as defined by facility) $ 150,000,000