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Equity (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 10, 2018
May 08, 2018
Jul. 20, 2018
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
May 08, 2017
Class of Stock [Line Items]                
Aggregate amount of repurchased shares           $ 287,000,000 $ 26,000,000  
Cash dividends declared per common share (in dollars per share)   $ 0.80   $ 0.8 $ 0.75 $ 1.6 $ 1.50  
Dividend declared date           May 08, 2018    
Dividend paid date           Jun. 15, 2018    
Dividend paid, record date           May 18, 2018    
Cash dividends           $ 128,000,000    
Accrued dividends through payment           2,000,000    
Subsequent Event [Member]                
Class of Stock [Line Items]                
Cash dividends declared per common share (in dollars per share) $ 0.80              
Treasury Stock [Member]                
Class of Stock [Line Items]                
Aggregate amount of repurchased shares           $ 287,000,000 $ 26,000,000  
Treasury Stock [Member] | Subsequent Event [Member]                
Class of Stock [Line Items]                
Aggregate amount of repurchased shares     $ 34,000,000          
Share Repurchase Program May 8, 2017 [Member]                
Class of Stock [Line Items]                
Amount of shares authorized to be repurchased               $ 1,500,000,000.0
Share Repurchase Program December 4, 2014 [Member] | Treasury Stock [Member]                
Class of Stock [Line Items]                
Number of common shares repurchased (in shares)           1,459,417    
Average price per share of repurchased shares (in dollars per share)           $ 196.97    
Share Repurchase Program December 4, 2014 [Member] | Treasury Stock [Member] | Subsequent Event [Member]                
Class of Stock [Line Items]                
Number of common shares repurchased (in shares)     172,082          
Average price per share of repurchased shares (in dollars per share)     $ 193.85