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Note 21: Other Postretirement Benefits (Detail) (USD $)
 2 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Remeasurement Reduction of Accumulated Postretirement Benefit Obligation $ 1,200,000,000    
Defined Benefit Plan, Actuarial Gain (Loss) 510,000,000    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 229,000,000 (510,000,000)  
Increase (Decrease) in Medical Benefits 460,000,000    
Defined Benefit Plan, Amortization of Net Gains (Losses) 10 284,000,000  
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments 9,000,000 9,000,000 3,000,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)   3,000,000  
Eliminated Benefits [Member]
      
Remeasurement Reduction of Accumulated Postretirement Benefit Obligation 739,000,000    
Other Postretirement Benefit Plans [Member]
      
Defined Benefit Plan, Actuarial Gain (Loss)   117,000,000 (4,000,000)
Defined Benefit Plan, Amortization of Net Gains (Losses) 5,000,000    
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 113,000,000    
Seeking To Terminate in Bankruptcy [Member]
      
Supplemental Unemployment Benefits, Continuation of Health Care $ 23,000,000 $ 23,000,000