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Changes in Capital Structure - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended
May 02, 2019
Apr. 30, 2019
Mar. 31, 2019
Mar. 12, 2019
Mar. 31, 2019
Mar. 31, 2018
Feb. 28, 2019
Dec. 31, 2018
Capital Structure                
Common stock, shares authorized (in shares)     500,000,000   500,000,000     500,000,000
Employee Stock Purchase Plan, minimum percentage of eligible compensation to purchase shares     1.00%          
Employee Stock Purchase Plan, maximum percentage of eligible compensation     10.00%          
Employee Stock Purchase Plan, exercise price as percentage of fair value     95.00%          
Shares repurchased, value         $ 749,000,000 $ 93,000,000    
Total number of shares purchased (in shares)         17,608,957      
Additional Paid-in Capital                
Capital Structure                
Shares repurchased, value         $ 10,000,000      
Accelerated Share Repurchase Program                
Capital Structure                
Shares repurchased, value       $ 390,000,000        
Stock repurchase program, authorized amount             $ 400,000,000  
Shares repurchased (in shares)       9,086,903        
Accelerated Share Repurchase Program | Subsequent Event                
Capital Structure                
Shares repurchased (in shares)   351,768            
Average price paid per share (in usd per share)   $ 42.38            
Accelerated Share Repurchase Program | Additional Paid-in Capital | Subsequent Event                
Capital Structure                
Remaining amount recorded in additional paid in capital   $ 10,000,000            
2018 Capital Allocation Plan                
Capital Structure                
Shares repurchased, value         $ 250,000,000      
Total number of shares purchased (in shares)         6,153,415      
Amounts paid for shares purchased         $ 250,000,000      
Capital Allocation Plan, Accelerated Repurchase Agreement February 2019                
Capital Structure                
Total number of shares purchased (in shares)       9,086,903        
Amounts paid for shares purchased       $ 400,000,000        
Capital Allocation Plan, Accelerated Repurchase Agreement February 2019 | Subsequent Event                
Capital Structure                
Total number of shares purchased (in shares)   351,768            
Amounts paid for shares purchased   $ 0            
2019 Capital Allocation Plan                
Capital Structure                
Total number of shares purchased (in shares)     2,368,639          
Amounts paid for shares purchased     $ 99,000,000          
2019 Capital Allocation Plan | Subsequent Event                
Capital Structure                
Total number of shares purchased (in shares)   39,140            
Amounts paid for shares purchased   $ 1,000,000            
Capital Allocation Plan                
Capital Structure                
Stock repurchase program, authorized amount             $ 1,000,000,000.0  
Total number of shares purchased (in shares)         17,608,957      
Amounts paid for shares purchased         $ 749,000,000      
Capital Allocation Plan | Subsequent Event                
Capital Structure                
Shares repurchased, value $ 500,000,000              
Average price paid per share (in usd per share) $ 42.21              
Total number of shares purchased (in shares) 17,999,865              
Amounts paid for shares purchased $ 750,000,000