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Taxes (Deferred Taxes Classification In Consolidated Balance Sheets) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2013
Jan. 31, 2012
Assets:    
Prepaid expenses and other $ 520 $ 815
Other assets and deferred charges 757 738
Asset subtotals 1,277 1,553
Liabilities:    
Accrued liabilities 116 41
Deferred income taxes and other 4,373 4,617
Liability subtotals 4,489 4,658
Net deferred tax liabilities $ 3,212 $ 3,105