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Stock-Based Compensation Narrative (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash Received from Exercise of Stock Options     $ 3,000,000 $ 0
Fair Value of Restricted Stock That Vested     19,000,000 7,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Expected Term     6 years 6 months [1] 6 years 6 months [1]
Risk Free Interest Rate     1.60%  
Expected Dividend Rate     0.00% [2] 0.00% [2]
Weighted Average Grant Date Fair Value     $ 5.18 $ 5.48
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested Restricted Stock, Beginning balance     3,510,358  
Nonvested Restricted Stock, Beginning balance, Weighted Average Grant Date Fair Value     $ 12.10  
Grants in Period     1,554,311  
Grants in Period, Weighted Average Grant Date Fair Value     $ 15.38  
Forfeitures in Period     135,638  
Forfeitures in Period, Weighted Average Grant Date Fair Value     $ 13.33  
Vested in Period     1,042,095  
Vested in Period, Weighted Average Grant Date Fair Value     $ 10.08  
Nonvested Restricted Stock, Ending balance 3,886,936   3,886,936  
Nonvested Restricted Stock, Ending balance, Weighted Average Grant Date Fair Value $ 13.89   $ 13.89  
Disclosure of Compensation Related Costs Share-based Payments (Textuals) [Abstract]        
Vesting period for graded and cliff vesting options - minimum     1 year  
Vesting period for graded and cliff vesting options - maximum     5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Minimum Range     5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Maximum Range     10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized for Directors 567,000   567,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized for Employees 27,533,000   27,533,000  
Vest Term of First Sub Grant     1 year  
Vest Term of the Second Sub-Grant     2 years  
Vest Term of the Third Sub-Grant     3 years  
Grants in Option Grants with Three Year Cliff Vesting     1  
Vesting term of option grants with three year cliff vesting     3 years  
Stock-based compensation expense 7,000,000 7,000,000 13,000,000 12,000,000
Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Risk Free Interest Rate       2.70%
Expected Volatility Rate     30.00% 31.20%
Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Risk Free Interest Rate       3.20%
Expected Volatility Rate     30.50% 31.70%
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 10,000,000   10,000,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 1 month 6 days  
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 25,000,000   25,000,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 8 months 12 days  
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 0   $ 0  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     10 months 24 days  
[1] Expected term calculated using the simplified method prescribed by the SEC due to the lack of sufficient historical exercise data to provide a reasonable basis to estimate the expected term.
[2] We have never paid cash dividends on our common stock, and it is not anticipated that any cash dividends will be paid on our common stock in the near future.