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Stockholders' Equity - Additional Information (Detail) - USD ($)
shares in Millions
 12 Months Ended
Dec. 07, 2017
Jan. 27, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 24, 2017
Equity, Class of Treasury Stock [Line Items]            
Stock repurchase program, remaining authorized amount     $ 717,500,000      
Repurchase of common stock     $ 2,274,000,000 $ 42,500,000 $ 183,700,000  
Shares repurchased (shares)     7.3 0.2 1.1  
Aggregate reduction in common stock and additional paid-in capital during stock repurchases     $ 152,000,000 $ 4,100,000 $ 16,300,000  
Amount charged to retained earnings during stock repurchases     2,122,000,000 $ 38,400,000 $ 167,400,000  
Goldman | ASR Program            
Equity, Class of Treasury Stock [Line Items]            
Repurchase of common stock $ 274,000,000 $ 2,000,000,000        
Shares repurchased (shares)   7.3        
Payment amount divided by closing price, percent   80.00%        
Common stock            
Equity, Class of Treasury Stock [Line Items]            
Stock repurchase program, authorized amount     6,200,000,000.0      
Stock repurchase program, increased to authorized amount     $ 3,000,000,000      
Common stock | Goldman | ASR Program            
Equity, Class of Treasury Stock [Line Items]            
Stock repurchase program, authorized amount           $ 2,000,000,000.0