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Changes in Capital Structure - Schedule of Repurchases Under Share Repurchase Programs (Details) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Aug. 07, 2019
Aug. 07, 2019
Jul. 31, 2019
Feb. 28, 2019
Jun. 30, 2019
Jun. 30, 2019
Schedule of Capitalization, Equity [Line Items]            
Total number of shares purchased (in shares)           26,621,029
Subsequent Event            
Schedule of Capitalization, Equity [Line Items]            
Total number of shares purchased (in shares)   5,586,536        
2018 Plan            
Schedule of Capitalization, Equity [Line Items]            
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            
Schedule of Capitalization, Equity [Line Items]            
Total number of shares purchased (in shares)         9,438,671  
Amounts paid for shares purchased         $ 400,000,000  
Capital Allocation Plan, Accelerated Repurchase Agreement February 2019 | Subsequent Event            
Schedule of Capitalization, Equity [Line Items]            
Total number of shares purchased (in shares)   5,586,536        
Amounts paid for shares purchased   $ 196,000,000        
Other repurchases            
Schedule of Capitalization, Equity [Line Items]            
Total number of shares purchased (in shares)         11,028,943  
Amounts paid for shares purchased         $ 404,000,000  
Other repurchases | Subsequent Event            
Schedule of Capitalization, Equity [Line Items]            
Additional number of shares authorized to be repurchased     $ 250,000,000      
Capital Allocation Plan            
Schedule of Capitalization, Equity [Line Items]            
Total number of shares purchased (in shares)           26,621,029
Amounts paid for shares purchased           $ 1,054,000,000
Capital Allocation Plan | Subsequent Event            
Schedule of Capitalization, Equity [Line Items]            
Total number of shares purchased (in shares) 32,207,565          
Amounts paid for shares purchased $ 1,250,000,000