Compensation Plans (Schedule of Stock Option Awards) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, December 31, 2010	62,887,000
Number of shares, granted	3,739,000
Number of shares, exercised	(20,677,000)
Number of shares, forfeited	(88,000)
Number of shares, cancelled	(815,000)
Options outstanding, December 31, 2011	45,046,000	[1]
Number of shares, exercisable, December 31, 2011	32,020,000
Weighted average exercise price outstanding, December 31, 2010	$ 38.83
Weighted average exercise price, granted	$ 51.85
Weighted average exercise price, exercised	$ 41.85
Weighted average exercise price, forfeited	$ 35.14
Weighted average exercise price, cancelled	$ 46.29
Weighted average exercise price outstanding, December 31, 2011	$ 38.40	[1]
Weighted average exercise price, exercisable, December 31, 2010	$ 39.88
Weighted average remaining contractual term, outstanding, years	2.68	[1]
Weighted average remaining contractual term, exercisable, years	1.75
Aggregate intrinsic value, outstanding	$ 381,386	[1]
Aggregate intrinsic value, exercisable	$ 214,349
2002 Corporate Sharing Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	200
Options outstanding, December 31, 2011	5,400,000
Option price	$ 44.50

[1] Includes 5.4 million options outstanding from the 2002 Corporate Sharing Program grants of 200 shares to all eligible employees at an option price of $44.50. These options expired in January 2012.