Preferred And Common Stock (Schedule Of Options Fully Vested And/Or Expected To Vest And Options Fully Vested And Exercisable) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Fully Vested and/or Expected to Vest, Number of options	46.8	[1]
Options Fully Vested and/or Expected to Vest, Weighted average remaining contractual life, years	3.67	[1]
Options Fully Vested and/or Expected to Vest, Weighted average exercise price	$ 17.41	[1]
Options Fully Vested and/or Expected to Vest, Intrinsic value	$ 7.0	[1]
Options Fully Vested and Exercisable, Number of options	28.8
Options Fully Vested and Exercisable, Weighted average remaining contractual life, years	2.21
Options Fully Vested and Exercisable, Weighted average exercise price	$ 20.90
Options Fully Vested and Exercisable, Intrinsic value	4.0
$6.12 - $19.93 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Fully Vested and/or Expected to Vest, Number of options	32.2	[1]
Options Fully Vested and/or Expected to Vest, Weighted average remaining contractual life, years	5.10	[1]
Options Fully Vested and/or Expected to Vest, Weighted average exercise price	$ 10.72	[1]
Options Fully Vested and/or Expected to Vest, Intrinsic value	7.0	[1]
Options Fully Vested and Exercisable, Number of options	14.2
Options Fully Vested and Exercisable, Weighted average remaining contractual life, years	3.94
Options Fully Vested and Exercisable, Weighted average exercise price	$ 9.32
Options Fully Vested and Exercisable, Intrinsic value	4.0
Range of exercise price, lower limit	$ 6.12
Range of exercise price, upper limit	$ 19.93
$19.94 - $27.71 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Fully Vested and/or Expected to Vest, Number of options	2.8	[1]
Options Fully Vested and/or Expected to Vest, Weighted average remaining contractual life, years	1.03	[1]
Options Fully Vested and/or Expected to Vest, Weighted average exercise price	$ 22.56	[1]
Options Fully Vested and Exercisable, Number of options	2.8
Options Fully Vested and Exercisable, Weighted average remaining contractual life, years	1.03
Options Fully Vested and Exercisable, Weighted average exercise price	$ 22.56
Options Fully Vested and Exercisable, Intrinsic value
Range of exercise price, lower limit	$ 19.94
Range of exercise price, upper limit	$ 27.71
$27.72 - $35.49 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Fully Vested and/or Expected to Vest, Number of options	4.1	[1]
Options Fully Vested and/or Expected to Vest, Weighted average remaining contractual life, years	0.94	[1]
Options Fully Vested and/or Expected to Vest, Weighted average exercise price	$ 29.47	[1]
Options Fully Vested and Exercisable, Number of options	4.1
Options Fully Vested and Exercisable, Weighted average remaining contractual life, years	0.94
Options Fully Vested and Exercisable, Weighted average exercise price	$ 29.47
Options Fully Vested and Exercisable, Intrinsic value
Range of exercise price, lower limit	$ 27.72
Range of exercise price, upper limit	$ 35.49
$35.50 - $47.35 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Fully Vested and/or Expected to Vest, Number of options	7.7	[1]
Options Fully Vested and/or Expected to Vest, Weighted average remaining contractual life, years	0.12	[1]
Options Fully Vested and/or Expected to Vest, Weighted average exercise price	$ 37.28	[1]
Options Fully Vested and Exercisable, Number of options	7.7
Options Fully Vested and Exercisable, Weighted average remaining contractual life, years	0.12
Options Fully Vested and Exercisable, Weighted average exercise price	$ 37.28
Options Fully Vested and Exercisable, Intrinsic value
Range of exercise price, lower limit	$ 35.50
Range of exercise price, upper limit	$ 47.35

[1] Expected forfeitures are immaterial to the Company and are not reflected in the table above.