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Selected Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Jan. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Selected summarized quarterly financial information for fiscal 2020 and 2019 is as follows:
1st
Quarter		2nd
Quarter		3rd
Quarter		4th
Quarter		Fiscal Year
(in millions, except per share data)
Fiscal 2020
Revenues$3,737  $3,997  $4,513  $4,851  $17,098  
Gross profit2,823  3,030  3,379  3,631  12,863  
Income (loss) from operations  210  58  65  (36) 297  
Net income (loss) $392  $91  $(109) $(248) $126  
Basic net income (loss) per share $0.51  $0.12  $(0.12) $(0.28) $0.15  
Diluted net income (loss) per share $0.49  $0.11  $(0.12) $(0.28) $0.15  
Fiscal 2019
Revenues$3,006  $3,281  $3,392  $3,603  $13,282  
Gross profit2,239  2,432  2,503  2,657  9,831  
Income from operations191  115  92  137  535  
Net income$344  $299  $105  $362  $1,110  
Basic net income per share$0.47  $0.40  $0.14  $0.47  $1.48  
Diluted net income per share$0.46  $0.39  $0.13  $0.46  $1.43