Annual report pursuant to Section 13 and 15(d)

MARKETABLE SECURITIES (Tables)

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MARKETABLE SECURITIES (Tables)
12 Months Ended
Dec. 31, 2021
Marketable Securities [Abstract]  
Summary of marketable securities
A summary of marketable securities, all of which are classified as current, was as follows:
December 31,
  2021 2020
In millions Cost
Gross unrealized gains/(losses) (1)
Estimated
fair value
Cost
Gross unrealized gains/(losses) (1)
Estimated
fair value
Equity securities            
Certificates of deposit $ 299  $   $ 299  $ 164  $ —  $ 164 
Debt mutual funds 254  2  256  267  272 
Equity mutual funds 29  10  39  19  24 
Debt securities 1    1  — 
Total marketable securities $ 583  $ 12  $ 595  $ 451  $ 10  $ 461 
(1) Unrealized gains and losses for debt securities are recorded in other comprehensive income while unrealized gains and losses for equity securities are recorded in "Other income, net" in our Consolidated Statements of Net Income.
Schedule of proceeds from sales and maturities of marketable securities
The proceeds from sales and maturities of marketable securities were as follows:
Years ended December 31,
In millions 2021 2020 2019
Proceeds from sales of marketable securities $ 494  $ 343  $ 258 
Proceeds from maturities of marketable securities 179  126  131 
Investments in marketable securities - liquidations $ 673  $ 469  $ 389