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Stock-Based Compensation Stock-Based Compensation (Stock Plans) (Details)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Restricted Stock Units (RSU) [Member]
Dec. 31, 2012
2010 Stock Plan [Member]
Dec. 31, 2012
2003 Stock Plan [Member]
Dec. 31, 2012
2010 Stock Plan [Member]
Dec. 31, 2012
2010 Stock Plan [Member]
Restricted Stock Units (RSU) [Member]
Dec. 31, 2012
Minimum [Member]
Restricted Stock Units (RSU) [Member]
Dec. 31, 2012
Minimum [Member]
PSU Other Than TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               21.0      
Shares Reserved For Issuance Of Stock Options               0.8      
Shares Reserved For Issuance Of Restricted Stock Units               8.2      
Shares Reserved For Issuance Of Performance Based Restricted Stock Units               3.1      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant               8.9      
Multiplier For Calculating Share Availability Under A Stock Plan           2.5          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years       3 years 1 year 1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 11.1 15.4 16.3 16.3     10.4        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 5.5 6.1 5.2 4.6     1.5