Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Capital Return Program (Details)

v3.8.0.1
Subsequent Events - Capital Return Program (Details) - USD ($)
$ / shares in Units, shares in Thousands
1 Months Ended 12 Months Ended
Jan. 23, 2018
Oct. 03, 2017
Jul. 11, 2017
Apr. 25, 2017
Jan. 24, 2017
Jan. 29, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Subsequent Event [Line Items]                  
Common stock repurchased, value             $ 1,403,283,000 $ 1,672,697,000 $ 2,015,947,000
Dividends declared per common share (in dollars per share)   $ 0.011 $ 0.01 $ 0.01 $ 0.01   $ 0.041 $ 0.01 $ 0
Common Stock                  
Subsequent Event [Line Items]                  
Stock repurchase program, aggregate authorized amount             $ 10,000,000,000    
Open Market                  
Subsequent Event [Line Items]                  
Common stock repurchased (in shares)             270,527 420,111 524,222
Common stock repurchased, value             $ 1,403,283,000 $ 1,672,697,000 $ 2,015,947,000
Subsequent Event                  
Subsequent Event [Line Items]                  
Dividends declared per common share (in dollars per share) $ 0.011                
Subsequent Event | Common Stock                  
Subsequent Event [Line Items]                  
Stock repurchase program, additional authorized amount $ 2,000,000,000                
Stock repurchase program, aggregate authorized amount $ 12,000,000,000                
Subsequent Event | Open Market                  
Subsequent Event [Line Items]                  
Common stock repurchased (in shares)           36,840      
Common stock repurchased, value           $ 202,006,000