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Capital Stock (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 30, 2020
Jan. 22, 2020
Dec. 20, 2019
Sep. 20, 2019
Jun. 21, 2019
Mar. 22, 2019
Dec. 21, 2018
Apr. 30, 2018
Feb. 28, 2018
Jan. 31, 2018
Nov. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2019
Class of Stock [Line Items]                              
Stock repurchase program, authorized amount                             $ 600,000,000.0
Accelerated stock repurchase program                     $ 750,000,000.0   $ (750,000,000) $ (750,000,000)  
Available to repurchase common stock                       $ 914,000,000.0      
Amount expended on share repurchases in open market transactions                       $ 453,853,000 $ 511,153,000 $ 574,956,000  
Total tax withholdings for share-based compensation (in shares)                       882,078 739,522 974,501  
Total tax withholding for share-based compensation                       $ (89,213,000) $ (71,593,000) $ (80,040,000)  
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 $ 0.35 $ 0.35 $ 0.35 $ 0.35                
Subsequent Event                              
Class of Stock [Line Items]                              
Share repurchase program, additional amount authorized   $ 1,000,000,000.00                          
Open Market Purchases                              
Class of Stock [Line Items]                              
Amount expended on share repurchases in open market transactions                       $ 453,900,000 $ 511,200,000 $ 575,000,000.0  
Number of shares repurchased                       4,533,688 4,730,542 7,384,368  
Average per share price on share repurchases in open market transactions (in dollars per share)                       $ 100.11 $ 108.05 $ 77.86  
ASR Counterparty                              
Class of Stock [Line Items]                              
Amount expended on share repurchases in open market transactions                 $ 750,000,000.0     $ 750,000,000.0      
Number of shares repurchased               1,600,000 6,500,000 1,400,000   7,100,000      
Shares repurchased as percentage of shares pursuant to accelerated share repurchase agreement (percent)                       80.00%      
ASR Counterparty | Subsequent Event                              
Class of Stock [Line Items]                              
Amount expended on share repurchases in open market transactions $ 1,000,000,000.00                            
Number of shares repurchased 6,500,000                            
Forecast                              
Class of Stock [Line Items]                              
Cash dividend paid (in dollars per share)   $ 0.35