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Debt and Commitments - Debt Instruments Convertible Notes (Details) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended 15 Months Ended 12 Months Ended 15 Months Ended 3 Months Ended 12 Months Ended 15 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Automotive [Member]
Dec. 31, 2010
Automotive [Member]
Dec. 31, 2009
Automotive [Member]
Jun. 30, 2009
Automotive [Member]
Convertible Notes [Member]
Dec. 31, 2011
Automotive [Member]
Convertible Notes [Member]
Dec. 31, 2010
Automotive [Member]
Convertible Notes [Member]
Dec. 31, 2011
Automotive [Member]
Convertible Notes [Member]
Dec. 31, 2011
Automotive [Member]
Convertible 2016 Notes [Member]
Dec. 31, 2010
Automotive [Member]
Convertible 2016 Notes [Member]
Dec. 31, 2009
Automotive [Member]
Convertible 2016 Notes [Member]
Dec. 31, 2011
Automotive [Member]
Convertible 2016 Notes [Member]
Nov. 03, 2009
Automotive [Member]
Convertible 2016 Notes [Member]
Jun. 30, 2009
Automotive [Member]
Convertible 2036 Notes [Member]
Dec. 31, 2011
Automotive [Member]
Convertible 2036 Notes [Member]
Dec. 31, 2010
Automotive [Member]
Convertible 2036 Notes [Member]
Dec. 31, 2011
Automotive [Member]
Convertible 2036 Notes [Member]
Dec. 06, 2006
Automotive [Member]
Convertible 2036 Notes [Member]
Dec. 31, 2011
Financial Services [Member]
Dec. 31, 2010
Financial Services [Member]
Dec. 31, 2009
Financial Services [Member]
Convertible Notes Narrative [Abstract]                                              
Debt                     $ 883,000,000 $ 883,000,000   $ 883,000,000     $ 25,000,000 $ 25,000,000 $ 25,000,000        
Interest rate, per annum                     4.25%     4.25%                  
Conversion rate (subject to adjustment), shares per principal amount                     107.5269     107.5269     108.6957   108.6957        
Principal amount applicable for conversion rate (subject to adjustment)                     1,000     1,000   1,000 1,000   1,000        
Conversion price, per share                     $ 9.30     $ 9.30     $ 9.20   $ 9.20        
Conversion premium                     25.00%           25.00%            
Closing price                             $ 7.44         $ 7.36      
Convertible note price to be paid of the principal amount in case of an event, percent                     100.00%                        
Increase in the market price of the company's stock that triggers the option to terminate conversion rights                     130.00%           140.00%            
Convertible note price to be paid of the principal amount upon redemption, percent                                 100.00%            
Minimum number of trading days in a consecutive day period for measuring conversion right termination                     20 days           20 days            
Range of trading days in a consecutive day period                     30 days           30 days            
Convertible Notes Table Narrative [Abstract]                                              
Liability component - Principal (before underwriter option)                     768,000,000 768,000,000   768,000,000                  
Liability component - Principal (underwriter option)                     115,000,000 115,000,000   115,000,000                  
Liability component - Principal                     883,000,000 883,000,000   883,000,000     25,000,000 25,000,000 25,000,000        
Liability component - Unamortized discount               (172,000,000) (199,000,000) (172,000,000)                     (152,000,000) (403,000,000)  
Net carrying amount               736,000,000 709,000,000 736,000,000                          
Equity component of outstanding debt (recorded in Capital in excess of par value of stock)               (225,000,000) (225,000,000) (225,000,000)                          
Share value in excess of principal value, if converted               143,000,000 732,000,000                            
Total effective rate on the liability component                     9.20% 9.20%         10.50% 10.50%          
Over-Allotment Option, percentage                     8.60% 8.60%                      
Share price if convertible notes were converted into shares                                 $ 10.76 $ 16.79 $ 10.76        
Interest cost [Abstract]                                              
Contractual interest coupon                     38,000,000 138,000,000 92,000,000                    
Amortization of discount                     27,000,000 87,000,000 59,000,000                    
Total interest cost on Convertible Notes                     65,000,000 225,000,000 151,000,000                    
Conversion Offers [Abstract]                                              
Principal amount of notes converted                           2,000,000,000   4,300,000,000     554,000,000        
Convertible note conversion, shares                   274,385,596           467,909,227              
Cash proceeds from conversion of convertible notes                   534,000,000           344,000,000              
Convertible note conversion, cash premium per $1000                       $ 215       $ 80   $ 190          
Gains (Losses) on extinguishment of debt $ (128,000,000) $ (983,000,000) $ 4,737,000,000 $ (60,000,000) $ (844,000,000) $ 4,666,000,000 $ 1,200,000,000     $ (962,000,000)                     $ (68,000,000) $ (139,000,000) $ 71,000,000