Earnings per Common Share - Schedule of EPS (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Weighted-average shares - basic (in shares)	413,696	415,840	420,188
Dilution effect of stock options, stock appreciation rights and stock awards at end of period (in shares)	0	1,761	2,187
Weighted-average shares - diluted (in shares)	413,696	417,601	422,375
Weighted-average shares excluded from diluted EPS due to the anti-dilutive effect (in shares)	1,481	20	5