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Derivative Financial Instruments (Tables)
 3 Months Ended
Apr. 30, 2017
Summary of Derivative Instruments [Abstract]  
Schedule of derivative instruments in statement of financial position, fair value
The Company's derivative instruments, as well as its nonderivative debt instruments designated and qualifying as net investment hedges, were classified as follows in the Company's Condensed Consolidated Balance Sheets:
 
April 30, 2017
 
January 31, 2017
(Amounts in millions)
Fair Value
Instruments
 
Net Investment
Instruments
 
Cash Flow
Instruments
 
Fair Value
Instruments
 
Net Investment
Instruments
 
Cash Flow
Instruments
Derivative instruments
 
 
 
 
 
 
 
 
 
 
 
Derivative assets:
 
 
 
 
 
 
 
 
 
 
 
Other assets and deferred charges
$
21

 
$
395

 
$
83

 
$
8

 
$
471

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
 
 
 
 
 
Deferred income taxes and other
5

 
—

 
607

 
12

 
—

 
618

 
 
 
 
 
 
 
 
 
 
 
 
Nonderivative hedging instruments
 
 
 
 
 
 
 
 
 
 
 
Long-term debt
—

 
3,328

 
—

 
—

 
3,209

 
—