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Description of Business and Significant Accounting Policies Cash Flows (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net income (loss) $ 481 $ (191) $ 270
Deferred income taxes 144 (130) (32)
Pension and indemnity plans (994) 452 (69)
Scenario, Previously Reported [Member]
     
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net income (loss) 146 52 137
Deferred income taxes (37) (13) (48)
Pension and indemnity plans (478) 92 80
Scenario, Adjusted [Member]
     
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net income (loss) 481 (191) 270
Deferred income taxes 144 (130) (32)
Pension and indemnity plans $ (994) $ 452 $ (69)