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Employee Incentive and Retirement Plans - Schedule of Options Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement [Abstract]      
Stock price ($ per share) $ 12.62    
Number of Options      
Outstanding (shares) 3,152,929    
Granted (shares) 0 0 0
Exercised (shares) (470,666)    
Forfeited/Expired (shares) (427,375)    
Outstanding (shares) 2,254,888 3,152,929  
Exercisable (shares) 2,193,730    
Weighted- Average Exercise Price Per Share      
Outstanding ($ per share) $ 25.80    
Granted ($ per share) 0    
Exercised ($ per share) 1.85    
Forfeited/Expired ($ per share) 33.74    
Outstanding ($ per share) 29.27 $ 25.80  
Exercisable ($ per share) $ 29.16    
Weighted-Average Remaining Contractual Life (in years)      
Outstanding at December 31, 2018 4 years 2 months 12 days    
Exercisable at December 31, 2018 4 years 1 month 6 days    
Intrinsic value, Outstanding at December 31, 2018 $ 5,528    
Intrinsic value, Exercisable at December 31, 2018 $ 5,528