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Debt And Financing Arrangements (Narrative) (Details)
€ in Millions
3 Months Ended 9 Months Ended
Sep. 10, 2021
USD ($)
Mar. 25, 2021
EUR (€)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 10, 2021
EUR (€)
Debt Instrument [Line Items]              
Debt Instrument, Issuance Date Sep. 10, 2021 Mar. 25, 2021          
Debt Instrument, Face Amount | €   € 500         € 750
Debt Instrument, Interest Rate, Stated Percentage             2.70%
Proceeds from Issuance of Unsecured Debt $ 732,000,000            
Excess of fair value over carrying value of long-term debt     $ 1,700,000,000   $ 1,700,000,000    
Debt Instrument, Maturity Date Sep. 15, 2051 Sep. 25, 2022          
Gain (Loss) on Extinguishment of Debt     $ 36,000,000 $ 396,000,000 $ 36,000,000 $ 410,000,000  
Notes Two Point Seven Hundred Fifty Percent due in Two Thousand Twenty Five              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage     2.75%   2.75%    
Extinguishment of Debt, Amount     $ 500,000,000        
Gain (Loss) on Extinguishment of Debt     36,000,000        
Line of Credit [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity     12,400,000,000   $ 12,400,000,000    
Unused lines of credit     10,500,000,000   10,500,000,000    
Commercial Paper [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity     6,500,000,000   6,500,000,000    
Commercial Paper     0   0    
Accounts Receivable Securitization Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity     2,100,000,000   2,100,000,000    
Unused lines of credit     $ 600,000,000   $ 600,000,000