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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Shares        
Unvested at beginning of period (in shares) 405 463 627  
Granted (in shares) 232 179 169  
Vested (in shares) (172) (217) (283)  
Forfeited (in shares) (14) (20) (50)  
Unvested at end of period (in shares) 451 405 463 627
Wtd. Avg. Price Per Share        
Unvested at beginning of period (in dollars per share) $ 64 $ 57 $ 54  
Granted (in dollars per share) 75 76 77  
Vested (in dollars per share) 62 59 63  
Forfeited (in dollars per share) 76 60 53  
Unvested at end of period (in dollars per share) $ 70 $ 64 $ 57 $ 54
Equity Other Than Options, Additional [Abstract]        
Unvested (in years) 1 year 4 months 24 days 1 year 3 months 18 days 1 year 2 months 12 days 1 year 3 months 18 days
Unvested $ 40