January 31, 2013 | January 31, 2012 | ||||||||||||||||||||||
(Amounts in millions) | Fair Value Instruments | Net Investment Instruments | Cash Flow Instruments | Fair Value Instruments | Net Investment Instruments | Cash Flow Instruments | |||||||||||||||||
Derivative instruments | |||||||||||||||||||||||
Prepaid expenses and other | $ | 29 | $ | — | $ | — | $ | 2 | $ | — | $ | — | |||||||||||
Other assets and deferred charges | 31 | 223 | 327 | 181 | 316 | 91 | |||||||||||||||||
Derivative asset subtotals | $ | 60 | $ | 223 | $ | 327 | $ | 183 | $ | 316 | $ | 91 | |||||||||||
Accrued liabilities | $ | — | $ | — | $ | 4 | $ | — | $ | — | $ | — | |||||||||||
Deferred income taxes and other | — | — | 91 | — | — | 110 | |||||||||||||||||
Derivative liability subtotals | $ | — | $ | — | $ | 95 | $ | — | $ | — | $ | 110 | |||||||||||
Nonderivative hedging instruments | |||||||||||||||||||||||
Long-term debt due within one year | $ | — | $ | 818 | $ | — | $ | — | $ | 785 | $ | — | |||||||||||
Long-term debt | — | 6,145 | — | — | 7,546 | — | |||||||||||||||||
Nonderivative hedge liability subtotals | $ | — | $ | 6,963 | $ | — | $ | — | $ | 8,331 | $ | — |