Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator for Basic and Diluted Earnings Per Share - [Abstract]
Net Income	$ 462,498	$ 355,491	$ 1,616,915	$ 1,075,278
Denominator for Basic Earnings Per Share - [Abstract]
Weighted Average Shares	270,471,000	267,941,000	269,934,000	267,136,000
Potential Dilutive Common Shares -[Abstract]
Stock Options/SARs	1,189,000	1,343,000	1,098,000	1,517,000
Restricted Stock/Units and Performance Units/Stock	1,916,000	1,698,000	1,824,000	1,675,000
Denominator for Diluted Earnings Per Share - [Abstract]
Adjusted Diluted Weighted Average Shares	273,576,000	270,982,000	272,856,000	270,328,000
Net Income Per Share [Abstract]
Basic	$ 1.71	$ 1.33	$ 5.99	$ 4.03
Diluted	$ 1.69	$ 1.31	$ 5.93	$ 3.98
Anti-dilutive Stock Options and SARs excluded from Diluted Earnings Per Share Calculation	300,000	500,000	100,000	300,000