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Changes in Capital Structure - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
May 24, 2018
Jan. 01, 2018
Aug. 02, 2018
Jul. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Feb. 28, 2018
Dec. 31, 2017
Capital Structure                  
Common stock, shares authorized (in shares)         500,000,000   500,000,000   500,000,000
Shares issued under ESPP (in shares)   175,862              
Stock repurchase program, authorized amount $ 354,000,000                
Stock repurchase program, amount, beginning immediately               $ 500,000,000  
Total number of shares purchased (in shares)             14,863,301    
Commissions per share (in dollars per share)         $ 0.01        
Shares received under ASR Agreement (in shares) 9,969,023                
Treasury                  
Capital Structure                  
Shares issued under ESPP (in shares)   175,862              
Total number of shares purchased (in shares)             14,863,301    
Accelerated Share Repurchase Program                  
Capital Structure                  
Value of shares received $ 343,000,000                
Accelerated Share Repurchase Program | Additional Paid-in Capital                  
Capital Structure                  
Remaining amount recorded in additional paid in capital $ 11,000,000                
Subsequent Event                  
Capital Structure                  
Average price paid per share (in dollars per share)     $ 31.80            
Commissions per share (in dollars per share)     $ 0.01            
Subsequent Event | Accelerated Share Repurchase Program                  
Capital Structure                  
Shares received under ASR Agreement (in shares)       860,880          
Average price paid per share under ASR Agreement (in dollars per share)       $ 32.69          
Subsequent Event | Accelerated Share Repurchase Program | Treasury                  
Capital Structure                  
Remaining amount recorded in additional paid in capital       $ 11,000,000          
Capital Allocation Plan                  
Capital Structure                  
Stock repurchase program, authorized amount               $ 1,000,000,000  
Total number of shares purchased (in shares)         11,748,553 3,114,748 14,863,301    
Amounts paid for shares purchased         $ 407,000,000 $ 93,000,000 $ 500,000,000    
Capital Allocation Plan | Subsequent Event                  
Capital Structure                  
Total number of shares purchased (in shares)     15,724,181 860,880          
Amounts paid for shares purchased     $ 500,000,000 $ 0