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Equity - Capital Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 02, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]        
Preferred stock authorized (shares)   2,000,000    
Par value of Preferred stock (in usd per share)   $ 1    
Preferred stock issued (in shares)   0    
Dividend history        
Quarterly dividend rate (in usd per share)   $ 0.41 $ 0.36 $ 0.330
Annualized dividend rate (in usd per share)   $ 1.64 $ 1.44 $ 1.32
Dividends paid   $ 421 $ 380 $ 363
Subsequent Event        
Dividend history        
Quarterly dividend rate (in usd per share) $ 0.50