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Investments
9 Months Ended
Oct. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Marketable Securities
At October 31, 2021, marketable securities consisted of the following (in millions):
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Fair Value
Corporate notes and obligations$2,881 $$(15)$2,871 
U.S. treasury securities212 (1)211 
Mortgage-backed obligations258 (2)257 
Asset-backed securities931 (2)930 
Municipal securities138 139 
Commercial paper40 40 
Covered bonds181 (2)179 
Other11 11 
Total marketable securities$4,652 $$(22)$4,638 
At January 31, 2021, marketable securities consisted of the following (in millions):
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Fair Value
Corporate notes and obligations$3,321 $20 $$3,341 
U.S. treasury securities205 206 
Mortgage-backed obligations382 387 
Asset-backed securities1,096 (1)1,101 
Municipal securities242 244 
Covered bonds328 328 
Other164 164 
Total marketable securities$5,738 $34 $(1)$5,771 
The contractual maturities of the investments classified as marketable securities were as follows (in millions):
 As of
 October 31, 2021January 31, 2021
Due within 1 year$1,742 $2,525 
Due in 1 year through 5 years2,884 3,236 
Due in 5 years through 10 years12 10 
$4,638 $5,771 
Strategic Investments
Strategic investments by form and measurement category as of October 31, 2021 were as follows (in millions):
 Measurement Category
 Fair ValueMeasurement AlternativeOtherTotal
Equity securities$603 $3,195 $123 $3,921 
Debt securities and other investments 83 83 
Balance as of October 31, 2021
$603 $3,195 $206 $4,004 
Strategic investments by form and measurement category as of January 31, 2021 were as follows (in millions):
 Measurement Category
 Fair ValueMeasurement AlternativeOtherTotal
Equity securities$2,068 $1,670 $120 $3,858 
Debt securities and other investments51 51 
Balance as of January 31, 2021
$2,068 $1,670 $171 $3,909 
Measurement Alternative Adjustments
The Company recognized $28 million and $6 million of impairments and downward adjustments and $131 million and $31 million of upward adjustments during the three months ended October 31, 2021 and 2020, respectively. The Company recognized $55 million and $82 million of impairments and downward adjustments and $933 million and $86 million of upward adjustments during the nine months ended October 31, 2021 and 2020. Approximately $369 million of the upward adjustments during the nine months ended October 31, 2021 was related to the mark-up of one of the Company’s privately held investments.
Since February 1, 2018, cumulative impairments and downward adjustments were $181 million and cumulative upward adjustments were $1.2 billion through October 31, 2021 for measurement alternative investments still held as of October 31, 2021.
Gains on Strategic Investments, Net
The components of gains and losses on strategic investments were as follows (in millions):
3Three Months Ended October 31,Nine Months Ended October 31,
2021202020212020
Unrealized gains (losses) recognized on publicly traded equity securities, net$98 $997 $(13)$1,620 
Unrealized gains recognized on privately held equity securities, net162 29 964 83 
Realized gains on sales of securities, net114 18 271 306 
Impairments on privately held equity and debt securities(11)(8)(45)(99)
Gains on strategic investments, net$363 $1,036 $1,177 $1,910 

Realized gains on sales of securities, net reflects the difference between the sale proceeds and the carrying value of the security at the beginning of the period or the purchase date, if later. The realized gains for the three months ended October 31, 2021 were primarily driven by the sale of one of the Company’s publicly traded investments resulting in a realized gain of $112 million. The realized gains for the nine months ended October 31, 2021 were also driven by the acquisition of one of the Company’s privately held equity investments in a stock and cash transaction by a publicly traded company of $155 million. The cumulative net gains, measured as the sale price less the initial purchase price, for equity securities exited during the three and nine months ended October 31, 2021 were $498 million and $1.6 billion, respectively. Cumulative net realized gains in the three and nine months ended October 31, 2021 include gains related to partial sales of two of the Company’s publicly traded investments, which resulted in cumulative net gains of $505 million and $1.5 billion, respectively.
In the three months ended October 31, 2021 and 2020, for strategic investments still held as of those respective period ends, the Company recognized net unrealized gains of $249 million and $1.0 billion, respectively. These include approximately $11 million and $8 million of impairments on privately held equity and debt securities in the three months ended October 31, 2021 and 2020, respectively.