XML 96 R97.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Class Of Stock [Line Items]        
Common Stock, shares authorized     55,000,000 55,000,000
Preferred stock, shares authorized     4,991,000  
Common Stock, shares issued     32,674,354 33,856,629
Common Stock, shares outstanding     32,674,354 33,856,629
Preferred stock, shares issued     0  
Preferred stock, shares outstanding     0  
Stock repurchase program period   3 years    
Stock repurchase program, authorized amount   $ 100    
Authorized increase and extension in stock repurchase program amount $ 300      
Stock repurchase program extended expiration date 2020-12      
Shares repurchased     63,000,000  
Shares repurchased average price paid per share     $ 39.67  
Remaining authorized repurchase amount     $ 83  
Maximum        
Class Of Stock [Line Items]        
Shares issued     59,991,000