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Fair Value Measurements (Tables)
 9 Months Ended
Oct. 31, 2012
Fair Value Disclosures [Abstract]  
Notional Amounts And Fair Values Of Interest Rate Swaps
 
October 31, 2012
 
January 31, 2012
(Amounts in millions)
Notional Amount
 
Fair Value
 
Notional Amount
 
Fair Value
Receive fixed-rate, pay floating-rate interest rate swaps designated as fair value hedges
$
3,445

 
$
92

 
$
3,945

 
$
183

Receive fixed-rate, pay fixed-rate cross-currency interest rate swaps designated as net investment hedges
1,250

 
234

 
1,250

 
316

Receive fixed-rate, pay fixed-rate cross-currency interest rate swaps designated as cash flow hedges
2,909

 
34

 
2,884

 
(3
)
Receive floating-rate, pay fixed-rate interest rate swaps designated as cash flow hedges
1,215

 
(11
)
 
1,270

 
(16
)
Receive floating-rate, pay fixed-rate forward starting interest rate swaps designated as cash flow hedges
5,000

 
(226
)
 
—

 
—

Total
$
13,819

 
$
123

 
$
9,349

 
$
480
Other Fair Value Disclosure [Table Text Block]
 
 
October 31, 2012
 
January 31, 2012
(Amounts in millions)
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt, including amounts due within one year
 
$
45,422

 
$
53,897

 
$
46,045

 
$
53,043