XML 137 R113.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stockholders' Equity - Narrative (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 17, 2018
Jul. 16, 2018
Dec. 31, 2015
Class of Stock [Line Items]            
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000        
Preferred stock, par value (in dollars per share)        
Stockholders' equity attributable to parent $ 10,508,300,000 $ 10,216,200,000 $ 9,770,400,000      
Number of shares authorized to be repurchased (in shares)       25,000,000 9,500,000  
Average price paid per share for common stock repurchased (in dollars per share) $ 102.69 $ 90.25 $ 67.91      
Upper Limit            
Class of Stock [Line Items]            
Stock repurchase authorized amount $ 529,500,000          
Series D Preferred Stock Depositary Shares            
Class of Stock [Line Items]            
Preferred stock, shares issued (in shares) 500,000          
Preferred stock, shares outstanding (in shares) 500,000          
Per share ownership interest, percentage 1.00%          
Preferred stock, par value (in dollars per share) $ 0          
Preferred stock, liquidation preference $ 100,000          
Depository shares, liquidation preference per share $ 1,000          
Series D Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, shares outstanding (in shares) 5,000 5,000        
Preferred stock $ 493,500,000 $ 493,500,000        
Preferred stock, annual dividend rate 4.60%          
Preferred stock, variable rate 3.202%          
Series C Preferred Stock, Depositary Shares            
Class of Stock [Line Items]            
Preferred stock, shares issued (in shares) 16,000,000          
Preferred stock, shares outstanding (in shares) 16,000,000          
Per share ownership interest, percentage 0.10%          
Preferred stock, par value (in dollars per share) $ 0          
Preferred stock, liquidation preference $ 25,000          
Depository shares, liquidation preference per share $ 25          
Series C Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, shares outstanding (in shares) 16,000 16,000        
Preferred stock $ 388,500,000 $ 388,500,000        
Preferred stock, annual dividend rate 5.85%          
Preferred Stock            
Class of Stock [Line Items]            
Stockholders' equity attributable to parent $ 882,000,000 882,000,000 $ 882,000,000     $ 388,500,000
Preferred Stock | Series C Preferred Stock            
Class of Stock [Line Items]            
Stockholders' equity attributable to parent $ 388,500,000 $ 388,500,000