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Retirement-Related Benefits (Tables)
 12 Months Ended
Jan. 31, 2019
Retirement Benefits [Abstract]  
Schedule of contribution expense related to defined contribution plans
The following table summarizes the contribution expense related to the Company's defined contribution plans for fiscal 2019, 2018 and 2017:
 
Fiscal Years Ended January 31,
(Amounts in millions)
2019
 
2018
 
2017
Defined contribution plans:
 
 
 
 
 
U.S.
$
1,165

 
$
1,124

 
$
1,064

International
126

 
126

 
173

Total contribution expense for defined contribution plans
$
1,291

 
$
1,250

 
$
1,237