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Stock Compensation Plans (Stock Option Activity Rollforward) (Details) - Stock options [Member] - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Option Activity [Roll Forward]      
Outstanding, beginning of year 9,370 12,887 17,148
Granted 0 0 0
Exercised (904) (1,422) (1,432)
Forfeited (2,426) (2,095) (2,829)
Outstanding, end of year 6,040 9,370 12,887
Options exercisable at year end 6,040 9,265 12,402
Weighted-average per share fair value of options granted during the year $ 0 $ 0 $ 0
Outstanding, weighted-average per share exercise price, beginning of year 23 23 22
Granted, weighted-average per share exercise price 0 0 0
Exercised, weighted-average per share exercise price 12 11 14
Forfeited, weighted-average per share exercise price 37 29 25
Options outstanding, weighted-average per share exercise price, end of year 19 23 23
Options exercisable at year end, weighted-average per share exercise price $ 19 $ 23 $ 23