Stock Compensation Plans Stock Options (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years		Dec. 31, 2010 years		Dec. 31, 2009 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	12,787,824		14,176,825
Options granted	1,799,765
Options exercised	(1,194,516)
Options expired	(1,280,327)
Options cancelled	(713,923)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 18.02
Vested and expected to vest	12,333,472
Exercisable	8,657,347
Available for grant	8,680,840
Options Outstanding Weighted Average Exercise Price	$ 14.84		$ 15.11
Options granted Weighted Average Exercise Price	$ 13.82
Options exercised Weighted Average Exercise Price	$ 6.81
Options expired weighted average exercise price	$ 22.13
Vested and expected to vest Weighted Average Exercise Price	$ 14.94
Exercisable Weighted Average Exercise Price	$ 16.12
Weighted Average Remaining Contractual Term (Years)	5.6
Vested and expected to vest Weighted Average Remaining Contractual Term (Years)	5.5
Exercisable Weighted Average Remaining Contractual Term (Years)	4.3
Outstanding Aggregate Intrinsic Value (In millions)	$ 19
Options exercised Aggregate Intrinsic Value (in millions)	10		1		3
Vested and expected to vest Intrinsic Value (in millions)	18
Exercisable Aggregate Intrinsic Value	$ 12
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 5.52
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 36.25
Weighted average fair value per share for the stock options	$ 6.94		$ 6.45		$ 4.08
Black-Scholes model assumptions:
Expected term (years)	6.25	[1]	6.25	[1]	5.99	[1]
Interest rate	2.28%	[1]	2.58%	[1]	2.39%	[1]
Volatility	49.50%	[1]	50.50%	[1]	79.60%	[1]
Dividend yield	0.00%	[1]	0.00%	[1]	0.00%	[1]
Grant Date February 22 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,395,991
Exercisable	3,897
Weighted Average Remaining Contractual Term (Years)	9.2
Exercise Price	$ 13.91
Grant Date February 23 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,317,503
Exercisable	360,336
Weighted Average Remaining Contractual Term (Years)	8.2
Exercise Price	$ 12.74
Grant Date February 26 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,746,313
Exercisable	866,605
Weighted Average Remaining Contractual Term (Years)	7.2
Exercise Price	$ 4.81
Grant Date February 21 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,175,896
Exercisable	988,135
Weighted Average Remaining Contractual Term (Years)	6.2
Exercise Price	$ 26.74
Grant Date February 27 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,287,090
Exercisable	1,287,090
Weighted Average Remaining Contractual Term (Years)	5.2
Exercise Price	$ 24.71
Grant Date December 6 2005 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	853,256
Exercisable	853,256
Weighted Average Remaining Contractual Term (Years)	3.9
Exercise Price	$ 17.15
Grant Date December 9 2004 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,480,941
Exercisable	1,480,941
Weighted Average Remaining Contractual Term (Years)	2.9
Exercise Price	$ 12.54
Grant Date December 2 2003 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	762,806
Exercisable	762,806
Weighted Average Remaining Contractual Term (Years)	1.9
Exercise Price	$ 6.81
Grant Date December 3 2002 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	386,605
Exercisable	386,605
Weighted Average Remaining Contractual Term (Years)	0.9
Exercise Price	$ 7.94
All Other Grant Dates [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	2,381,423	[2]
Exercisable	1,667,676	[2]
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Remaining Contractual Term (Years)	4.9
Exercise Price	$ 16.99
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Remaining Contractual Term (Years)	3.3
Exercise Price	$ 18.64

[1] We review the assumptions used in our Black-Scholes model in conjunction with estimating the grant date fair value of the annual grants of stock-based awards by our Board of Directors.

[2] Options in the “All other” category had exercise prices ranging from $5.52 to $36.25. The weighted average exercise price for options outstanding and exercisable in that category was $16.99 and $18.64, respectively, while the remaining weighted average contractual term was 4.9 years and 3.3 years, respectively.