Stock-Based Compensation Plans (Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shares
Closing Balance (in shares)	9,122,762
Options outstanding - end of the year (in shares)	7,140,772
Per share weighted average exercise prices
Closing Balance (in dollars per shares)	$ 27.13
Options exercisable - end of the year (in dollars per share)	$ 29.66
Stock Options
Shares
Closing Balance (in shares)	8,771,600	10,708,694
Granted (in shares)	1,758,760	200,000	0
Canceled (in shares)	(157,176)	(100,200)
Expired (in shares)	(1,250,422)	(2,036,894)
Closing Balance (in shares)	9,122,762	8,771,600	10,708,694
Options outstanding - end of the year (in shares)	7,140,772	8,054,932
Per share weighted average exercise prices
Opening Balance (in dollars per shares)	$ 31.26	$ 34.27
Granted (in dollars per share)	16.87	24.79
Canceled (in dollars per share)	19.48	31.59
Expired (in dollars per share)	42.62	46.42
Closing Balance (in dollars per shares)	27.13	31.26	$ 34.27
Options exercisable - end of the year (in dollars per share)	$ 27.47	$ 32.14