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Equity - Capital Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 27, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Preferred stock authorized (shares)   2,000,000    
Par value of preferred stock (USD per share)   $ 1    
Preferred stock issued (shares)   0    
Dividend history        
Quarterly dividend rate (USD per share)   $ 0.67 $ 0.57 $ 0.50
Annualized dividend rate (USD per share)   $ 2.68 $ 2.28 $ 2.00
Dividends paid   $ 645 $ 560 $ 503
Subsequent event        
Dividend history        
Quarterly dividend rate (USD per share) $ 0.77