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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
OPERATING ACTIVITIES      
Net income (loss) $ 1,015 $ 1,003 $ (453)
Items not involving current cash flows 826 720 1,035
Profit loss after adjustment of non cash items 1,841 1,723 582
Changes in non-cash operating assets and liabilities (631) 155 (63)
Cash provided from operating activities 1,210 1,878 519
INVESTMENT ACTIVITIES      
Fixed asset additions (1,236) (746) (616)
Purchase of subsidiaries (120) (106) (50)
Increase in investments and other assets (196) (149) (236)
Deconsolidation of E-Car   (91)  
Disposal of facilities 112 30  
Proceeds from disposition 168 244 68
Cash used for investment activities (1,272) (818) (834)
FINANCING ACTIVITIES      
Increase (decrease) in bank indebtedness 150 (8) (851)
Repayments of debt (24) (71) (296)
Issues of debt 11 22 5
Issues of Common Shares 59 48 2
Settlement of stock options (30) (12)  
Repurchase of Common Shares (407) (23)  
Settlement of stock appreciation rights     (1)
Contribution to subsidiaries by non-controlling interests 20    
Dividends paid (236) (100) (21)
Cash used for financing activities (457) (444) (1,162)
Effect of exchange rate changes on cash and cash equivalents (37) (5) 60
Net (decrease) increase in cash and cash equivalents during the year (556) 611 (1,417)
Cash and cash equivalents, beginning of year 1,881 1,270 2,687
Cash and cash equivalents, end of year 1,325 1,881 1,270
Common Class B [Member]
      
FINANCING ACTIVITIES      
Repurchase of Common Shares   $ (300)