Shareholders' Equity (Stock Option Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance	27,043,000	27,881,000	28,964,000
Balance, weighted avg. price	$ 20.06	$ 20.42	$ 20.09
Granted	2,470,000	2,534,000	2,883,000
Granted, weighted avg. price	$ 22.40	$ 15.77	$ 23.84
Exercised	3,136,000	1,364,000	1,633,000
Exercised, weighted avg. price	$ 15.19	$ 16.37	$ 16.04
Expired or canceled	767,000	2,008,000	2,333,000
Expired or canceled, weighted avg. price	$ 22.61	$ 22.07	$ 23.68
Balance	25,610,000	27,043,000	27,881,000
Balance, weighted avg. price	$ 20.81	$ 20.06	$ 20.42
Total options that were exercisable	9,760,000	11,680,000	14,247,000
Exercisable shares, weighted avg. price	$ 18.11
Available for future grant as of December 31, 2012	2,569,000