Derivative Financial Instruments (Tables)

3 Months Ended

Apr. 30, 2018

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, 2018						January 31, 2018
(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 long-term assets	$	—	$	217	$	252	$	—	$	208	$	300
Derivative liabilities:
Deferred income taxes and other	145		—		121		91		—		95
Nonderivative hedging instruments
Long-term debt	—		3,975		—		—		4,041		—