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Financing (2019 Long-Term Debt Repayments) (Narrative) (Details)
$ / shares in Units, € in Millions, $ in Millions
3 Months Ended 12 Months Ended
Oct. 24, 2019
USD ($)
$ / shares
Jul. 08, 2019
EUR (€)
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]            
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 | 2.4% senior unsecured notes due 2020            
Debt Instrument [Line Items]            
Repayments of debt $ 500          
Interest rate of debt instrument 2.40%   2.40%   2.40%  
Senior notes | 5.0% senior unsecured notes due 2020            
Debt Instrument [Line Items]            
Repayments of debt $ 375          
Interest rate of debt instrument 5.00%   5.00%   5.00%  
Senior notes | 1.0% senior notes due 2019            
Debt Instrument [Line Items]            
Repayments of debt | €   € 600