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Capital Stock (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 22, 2019
Dec. 21, 2018
Apr. 30, 2018
Feb. 28, 2018
Jan. 31, 2018
Nov. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2018
Jun. 30, 2014
Class of Stock [Line Items]                      
Stock repurchase program, authorized amount           $ 1,700,000,000.0       $ 750,000,000 $ 1,500,000,000
Accelerated stock repurchase program           $ 750,000,000 $ (750,000,000) $ (750,000,000)      
Available to repurchase common stock             767,900,000        
Amount expended on share repurchases in open market transactions             $ 511,153,000 $ 574,956,000 $ 28,689,000    
Total tax withholdings for share-based compensation (in shares)             739,522 974,501 830,155    
Total tax withholdings for share-based compensation             $ 71,593,000 $ 80,040,000 $ 66,638,000    
Preferred stock, shares authorized             5,000,000 5,000,000      
Preferred stock, par value (in dollars per share)             $ 0.01 $ 0.01      
Preferred stock, shares issued             0 0      
Preferred stock, shares outstanding             0 0      
Cash dividend paid (in dollars per share)   $ 0.35                  
Open Market Purchases                      
Class of Stock [Line Items]                      
Amount expended on share repurchases in open market transactions             $ 511,200,000 $ 575,000,000 $ 28,700,000    
Number of shares repurchased             4,730,542 7,384,368 426,300    
Average per share price on share repurchases in open market transactions (in dollars per share)             $ 108.05 $ 77.86 $ 67.30    
ASR Counterparty                      
Class of Stock [Line Items]                      
Amount expended on share repurchases in open market transactions       $ 750,000,000     $ 750,000,000        
Number of shares repurchased     1,600,000 6,500,000 1,371,495   7,100,000.0        
Shares repurchased as percentage of shares pursuant to accelerated share repurchase agreement (percent)             80.00%        
Forecast                      
Class of Stock [Line Items]                      
Cash dividend paid (in dollars per share) $ 0.35