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Financing (2020 Financing Activity) (Details)
$ / shares in Units, € in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 24, 2019
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
$ / shares
Jul. 03, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Debt Instrument [Line Items]                    
Proceeds from the public offering of common stock, net of issuance costs           $ 1,729 $ 1,443 $ 0    
Proceeds from the public offering of preferred stock, net of issuance costs           1,668 1,600 0    
Payments of debt extinguishment costs $ 7     $ 7   26 $ 7 $ 0    
Payments of debt extinguishment costs, after-tax $ 5     $ 5            
Payments of debt extinguishment costs, per diluted common share | $ / shares $ 0.01     $ 0.01            
Senior notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount   $ 1,000       1,000        
Euronotes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount   $ 2,700       $ 2,700     € 2,500  
1.7% senior unsecured notes due 2022 | Senior notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount | €                   € 800
Repayments of debt | €     € 800              
Interest rate of debt instrument   1.70%   1.70%   1.70% 1.70%   1.70% 1.70%
Payments of debt extinguishment costs   $ 26                
Payments of debt extinguishment costs, after-tax   $ 20                
Payments of debt extinguishment costs, per diluted common share | $ / shares   $ 0.03                
Revolving credit facility | Five-Year Facility | Long-term debt                    
Debt Instrument [Line Items]                    
Proceeds from lines of credit         $ 2,500          
Line of credit, maximum borrowing capacity       $ 5,000     $ 5,000      
Revolving credit facility | Superseded 364-Day Facility | Short-term debt                    
Debt Instrument [Line Items]                    
Proceeds from lines of credit         2,500          
Line of credit, maximum borrowing capacity       $ 5,000     $ 5,000      
Revolving credit facility | 364-Day Facility | Short-term debt                    
Debt Instrument [Line Items]                    
Line of credit, maximum borrowing capacity         $ 2,500