Incentive Based Compensation Plans (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2013
Stock Options
Beginning year stock option awards	19,536,965
Granted stock option awards	1,704,734	[1]
Exercised stock option awards	(2,098,887)
Canceled stock option awards	(708,701)
End of year stock option awards	18,434,111
Beginning year weighted average exercise price	$ 26.19
Granted weighted average exercise price	$ 33.30
Exercises weighted average exercise price	$ 22.31
Canceled weighted average exercise price	$ 34.01
End of year weighted average exercise price	$ 26.99
Stock options weighted average grant date fair value	$ 10.51

[1] The weighted average grant date fair value of stock option awards granted was $10.51 per share.