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Fair Value Measurements (Tables)
 12 Months Ended
Jan. 31, 2021
Fair Value Disclosures [Abstract]  
Fair value measurements recurring and nonrecurring The fair value of the Company's equity investments with readily determinable fair values are as follows:
(Amounts in millions)Fair Value as of January 31, 2021Fair Value as of January 31, 2020
Equity investments measured using Level 1 inputs$6,517 $2,715 
Equity investments measured using Level 2 inputs7,905 2,723 
Total$14,422 $5,438 
Notional amounts and fair values of derivatives As of January 31, 2021 and January 31, 2020, the notional amounts and fair values of these derivatives were as follows:
 January 31, 2021January 31, 2020
(Amounts in millions)Notional AmountFair ValueNotional AmountFair Value
Receive fixed-rate, pay variable-rate interest rate swaps designated as fair value hedges$3,250 $166 (1)$4,000 $97 (1)
Receive fixed-rate, pay fixed-rate cross-currency swaps designated as net investment hedges1,250 311 (1)3,750 455 (1)
Receive fixed-rate, pay fixed-rate cross-currency swaps designated as cash flow hedges5,073 (394)(3)4,067 (696)(2)
Total$9,573 $83 $11,817 $(144)
(1)Classified in other long-term assets within the Company's Consolidated Balance Sheets.
(2)Classified in deferred income taxes and other within the Company's Consolidated Balance Sheets.
(3)Approximately $456 million of cash flow hedges were classified in deferred income taxes and other and $62 million of cash flow were classified in other long-term assets in the Company's Consolidated Balance Sheets.
Carrying value and fair value of long-term debt The carrying value and fair value of the Company's long-term debt as of January 31, 2021 and 2020, are as follows:
 January 31, 2021January 31, 2020
(Amounts in millions)Carrying ValueFair ValueCarrying ValueFair Value
Long-term debt, including amounts due within one year$44,309 $54,240 $49,076 $57,769