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Changes in Capital Structure - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Jan. 01, 2018
Mar. 31, 2018
Mar. 31, 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, amount, beginning immediately       $ 500  
Total number of shares purchased     3,114,748    
Commissions per share (in dollars per share)   $ 0.0001      
Capital Allocation Plan          
Capital Structure          
Stock repurchase program, authorized amount       $ 1,000  
Total number of shares purchased   3,114,748      
Average price paid per share (in dollars per share)   $ 29.75      
Amounts paid for shares purchased   $ 93