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Note 21: Other Postretirement Benefits (Detail) - Changes in Benefit Obligations Recognized in Other Comprehensive (Loss) (USD $)
In Millions, unless otherwise specified
2 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Newly established (loss) gain   $ (117) $ 4
Newly established prior service credit   460  
Amortization of:      
Prior service credit   (83) (77)
Net actuarial loss   26 32
Prior service credit recognized due to curtailment (9) (9) (3)
Net loss recognized in expense due to settlement (229) 510  
Total amount recognized in Other comprehensive loss   $ 787 $ (41)