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Retirement-Related Benefits (Tables)
 12 Months Ended
Jan. 31, 2017
Retirement Related Benefits [Abstract]  
Schedule of costs of retirement plans
The following table summarizes the contribution expense related to the Company's retirement-related benefits for fiscal 2017, 2016 and 2015:
 
Fiscal Years Ended January 31,
(Amounts in millions)
2017
 
2016
 
2015
Defined contribution plans:
 
 
 
 
 
U.S.
$
1,064

 
$
967

 
$
898

International
173

 
179

 
167

Defined benefit plans:
 
 
 
 
 
International
7

 
6

 
5

Total contribution expense for retirement-related benefits
$
1,244

 
$
1,152

 
$
1,070