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Share Based Compensation (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total charge for share-based compensation expense $ 29,000,000 $ 40,000,000 $ 53,000,000
Cash used to settle equity instruments granted under share-based compensation plans 0 2,000,000 2,000,000
Aggregate intrinsic value of vested options/SARs 0    
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options   1,000,000 1,000,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options 0    
2003 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number for common shares authorized for distribution 42,680,000    
1998 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number for common shares authorized for distribution 23,700,000    
2009 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number for common shares authorized for distribution 4,000,000    
Performance Award [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 6,144,000 6,341,695  
Unrecognized compensation cost 2,000,000    
Aggregate Intrinsic Value - Outstanding at December 31 4,915,200    
Weighted Average Remaining Contractual Term - Outstanding at December 31 (in years) 0.2    
Weighted-average grant date fair value of share   $ 6.58 $ 7.01
Deferred Compensation Arrangement with Individual, Requisite Service Period 36    
Performance Award [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Relative stock price performance range 0.00%    
Performance Award [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Relative stock price performance range 175.00%    
Deferred Award [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 6,765,057 7,271,021  
Weighted-average grant date fair value of options/SARs granted   $ 6.29 $ 7.05
Unrecognized compensation cost 6,000,000    
Term of unrecognized compensation cost expected to be recognized (in years) 2.3    
Aggregate Intrinsic Value - Outstanding at December 31 5,412,045    
Weighted Average Remaining Contractual Term - Outstanding at December 31 (in years) 0.9    
Deferred Compensation Arrangement with Individual, Requisite Service Period 36 months    
Fair value of awards settled for deferred awards   1,000,000 3,000,000
Other Award [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 1,000,000    
Term of unrecognized compensation cost expected to be recognized (in years) 1.3    
Aggregate Intrinsic Value - Outstanding at December 31 2,000,000    
Weighted Average Remaining Contractual Term - Outstanding at December 31 (in years) 1.3    
Fair value of awards settled for deferred awards 0 2,000,000 2,000,000
LTIP Plans and 2003 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 4,658,406 7,468,019  
Weighted-average grant date fair value of options/SARs granted   $ 3.59 $ 3.97
Total intrinsic value of options/SARs     1,000,000
Unrecognized compensation cost 6,000,000    
Term of unrecognized compensation cost expected to be recognized (in years) 2.5    
Fair value of stock options/SARs vested 5,000,000 7,000,000 11,000,000
Weighted-average grant date fair value of share $ 0.00    
LTIP Plans and 2003 Plan [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of options/SARs   $ 1,000,000