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Share-Based Compensation Plans - Restricted Stock Activity (Details) - Restricted stock - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Shares        
Unvested at beginning of period (in shares) 463 627 589  
Granted (in shares) 179 169 192  
Vested (in shares) (217) (283) (90)  
Forfeited (in shares) (20) (50) (64)  
Unvested at end of period (in shares) 405 463 627 589
Wtd. Avg. Price Per Share        
Unvested at beginning of period (in dollars per share) $ 57 $ 54 $ 55  
Granted (in dollars per share) 76 77 52  
Vested (in dollars per share) 59 63 52  
Forfeited (in dollars per share) 60 53 56  
Unvested at end of period (in dollars per share) $ 64 $ 57 $ 54 $ 55
Equity Other Than Options, Additional [Abstract]        
Unvested (in years) 1 year 3 months 18 days 1 year 2 months 12 days 1 year 3 months 18 days 1 year 8 months 12 days
Unvested $ 34