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Long-Term Incentive Employee Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Y
Long-Term Incentive Employee Compensation (Textual) [Abstract]  
Stock option exercised 2.1
Proceeds from stock option exercised $ 35
Shares of RS on which restrictions lapsed 0.3
Unrecognized compensation cost related to non-vested NQOs and RS 28
Unrecognized compensation cost weighted-average period 2.4
Restricted Stock [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted , shares 0.3
Grant date fair value $ 22.80
Period in which NOQs Vest 3 years
TSR Plan Awards [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted , shares 3.0
Grant date fair value $ 1.00
Period in which NOQs Vest 3 years
Total Unrecognized compensation cost $ 3
Unrecognized compensation cost weighted-average amortization period 2 years 9 months
Non Qualified Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options granted awards with a contractual term 10 years
Granted , shares 0.4
Grant date fair value $ 6.71
Period in which NOQs Vest 3 years
Equal Installments for NOQs 3 years