Stock-Based Compensation (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Long-Term Performance Based Plans
Stock option activity
Total options outstanding, end of period (in shares)	7,790,500	7,929,250	9,549,375
Weighted-Average Exercise Price
Total options outstanding at the end of the period (in dollars per share)	$ 24.02	$ 18.85	$ 19.20
Stock options
Stock option activity
Total options outstanding, beginning of period (in shares)	16,399,870	21,336,159	21,918,500
Granted (in shares)	2,225,500	591,500	3,246,000
Exercised (in shares)	(4,419,396)	(4,940,393)	(2,347,341)
Forfeited and cancelled (in shares)	(147,400)	(587,396)	(1,481,000)
Total options outstanding, end of period (in shares)	14,058,574	16,399,870	21,336,159
Exercisable at the end of the period (in shares)	4,799,173	6,011,719	8,389,683
Weighted-Average Exercise Price
Total options outstanding, beginning of the period (in dollars per share)	$ 19.04	$ 20.53	$ 18.62
Granted (in dollars per share)	$ 36.75	$ 32.25	$ 28.55
Exercised (in dollars per share)	$ 16.30	$ 18.46	$ 15.73
Forfeited and cancelled (in dollars per share)	$ 29.26	$ 20.44	$ 17.44
Total options outstanding at the end of the period (in dollars per share)	$ 21.71	$ 19.04	$ 20.53
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 17.14	$ 18.31	$ 21.70
Share-based compensation additional disclosures
Tax benefit from stock awards exercised	$ 38,947	$ 23,378	$ 9,911
Additional disclosures
Aggregate intrinsic value of stock options outstanding	509,024
Aggregate intrinsic value of stock options exercisable	$ 195,714