XML 126 R109.htm IDEA: XBRL DOCUMENT v3.6.0.2
Employee Benefit Plans (Summary of Stock Unit Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Units      
Units, Issued (in shares) (1,122,244)    
Restricted Stock Units (RSUs)      
Stock Units      
Units, Outstanding, Beginning of period (in shares) 3,134,615    
Units, Granted (in shares) 955,923    
Units, Forfeited (in shares) (48,877)    
Units, Issued (in shares) (1,398,522)    
Units, Outstanding, End of period (in shares) 2,643,139 3,134,615  
Units, Not Vested, End of period Units, Issued (in shares) 1,656,407    
Weighted-Average Grant-Date Fair Value      
Units, Outstanding, Beginning of period (in dollars per share) $ 60.19    
Units, Granted (in dollars per share) 78.56 $ 74.09 $ 73.28
Units, Forfeited (in dollars per share) 75.33    
Units, Issued (in dollars per share) 51.27    
Units, Outstanding, End of period (in dollars per share) 71.28 $ 60.19  
Units, Not Vested, End of period (in dollars per share) $ 72.06    
Units, Issued $ 109 $ 107 $ 116