Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator for Basic and Diluted Earnings per Share - [Abstract]
Net Income	$ 659,692	$ 395,778	$ 1,154,417	$ 719,787
Denominator for Basic Earnings per Share - [Abstract]
Weighted Average Shares	270,016,000	266,874,000	269,665,000	266,718,000
Potential Dilutive Common Shares -[Abstract]
Stock Options/SARs	987,000	1,428,000	1,050,000	1,611,000
Restricted Stock/Units and Performance Units/Stock	1,736,000	1,683,000	1,758,000	1,754,000
Denominator for Diluted Earnings per Share - [Abstract]
Adjusted Diluted Weighted Average Shares	272,739,000	269,985,000	272,473,000	270,083,000
Net Income Per Share [Abstract]
Basic	$ 2.44	$ 1.48	$ 4.28	$ 2.70
Diluted	$ 2.42	$ 1.47	$ 4.24	$ 2.67
Antidilutive Stock Options and SARs excluded from Diluted Earnings Per Share Calculation	100,000	300,000	100,000	200,000