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Financing (Narrative) (Details)
$ / shares in Units, shares in Thousands, € in Millions
3 Months Ended
Apr. 08, 2020
USD ($)
Apr. 08, 2020
EUR (€)
Apr. 07, 2020
USD ($)
Apr. 03, 2020
USD ($)
$ / shares
Apr. 03, 2020
USD ($)
$ / shares
Mar. 31, 2020
Mar. 30, 2020
USD ($)
Mar. 30, 2020
EUR (€)
Mar. 24, 2020
USD ($)
Apr. 03, 2020
USD ($)
$ / shares
shares
May 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Debt Instrument [Line Items]                        
Debt discounts, premiums and debt issuance costs       $ 131,000,000 $ 131,000,000         $ 131,000,000   $ 112,000,000
Common stock, par value | $ / shares       $ 0.01 $ 0.01         $ 0.01   $ 0.01
Commercial paper                        
Debt Instrument [Line Items]                        
Long-term commercial paper       $ 2,500,000,000 $ 2,500,000,000         $ 2,500,000,000    
Weighted average interest rate of long-term debt, interest rate       0.20% 0.20%         0.20%    
Weighted average maturity of long-term debt, at point in time       56 days                
Commercial paper | Subsequent event                        
Debt Instrument [Line Items]                        
Short-term and long-term commercial paper                     $ 3,400,000,000  
Senior notes                        
Debt Instrument [Line Items]                        
Proceeds from issuance of debt             $ 1,900,000,000 € 1,700        
Senior notes | Subsequent event                        
Debt Instrument [Line Items]                        
Proceeds from issuance of debt $ 816,000,000 € 754                    
Zero-coupon LYONs due 2021 | Convertible debt                        
Debt Instrument [Line Items]                        
Shares issued under debt conversion, shares | shares                   10    
Revolving credit facility | Subsequent event                        
Debt Instrument [Line Items]                        
Line of credit                     $ 5,000,000,000.0  
Long-term debt | Revolving credit facility | 5-year revolving credit facility                        
Debt Instrument [Line Items]                        
Line of credit       $ 5,000,000,000.0 $ 5,000,000,000.0         $ 5,000,000,000.0    
Long-term line of credit                 $ 2,500,000,000      
Line of credit facility, interest rate         1.90% 1.70%            
Line of credit, outstanding       2,500,000,000 $ 2,500,000,000         2,500,000,000    
Short-term debt | Revolving credit facility | 364-day revolving credit facility                        
Debt Instrument [Line Items]                        
Line of credit       $ 5,000,000,000.0 5,000,000,000.0         5,000,000,000.0    
Debt instrument, covenants, conversion fee, percent       0.75%                
Line of credit, short-term, outstanding       $ 0 $ 0         $ 0    
Short-term debt | Revolving credit facility | 364-day revolving credit facility | Subsequent event                        
Debt Instrument [Line Items]                        
Long-term line of credit     $ 2,500,000,000                  
Line of credit facility, interest rate     2.30%