Derivative Financial Instruments (Tables)

12 Months Ended

Jan. 31, 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 Consolidated Balance Sheets:

	January 31, 2017						January 31, 2016
(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	$	8	$	471	$	—	$	173	$	319	$	129
Derivative liabilities:
Deferred income taxes and other	12		—		618		—		—		738
Nonderivative hedging instruments
Long-term debt	—		3,209		—		—		3,644		—