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Marketable and Other Securities
6 Months Ended
Jun. 30, 2024
Marketable Securities [Abstract]  
Marketable and Other Securities Marketable and Other Securities
The following table summarizes the fair value of cash equivalents and marketable debt securities, which approximates cost:
Fair Value LevelJune 30, 2024December 31, 2023
Cash and cash equivalents
Cash and time deposits$12,777 $8,977 
Available-for-sale debt securities
U.S. government and agencies2200 211 
Corporate debt22,936 1,439 
Sovereign debt21,310 734 
Total available-for-sale debt securities – cash equivalents4,446 2,384 
Money market funds15,292 7,491 
Total cash and cash equivalents$22,516 $18,853 
Marketable debt securities
U.S. government and agencies2$3,575 $3,495 
Corporate debt and other24,160 3,529 
Mortgage and asset-backed2577 589 
Total available-for-sale debt securities – marketable securities$8,313 $7,613 
Restricted cash
Cash and cash equivalents $354 $277 
Money market funds12,750 2,787 
Total restricted cash$3,104 $3,064 
Available-for-sale debt securities included above with contractual maturities(a)
Due in one year or less$6,225 
Due between one and five years5,787 
Total available-for-sale debt securities with contractual maturities$12,012 
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(a)Excludes mortgage and asset-backed securities of $577 million at June 30, 2024 as these securities are not due at a single maturity date.

Proceeds from the sale of available-for-sale debt securities sold prior to maturity were $584 million and $638 million in the three months ended June 30, 2024 and 2023 and $1.1 billion and $1.0 billion in the six months ended June 30, 2024 and 2023. Net unrealized gains and losses on available-for-sale debt securities were insignificant in the three months ended June 30, 2024 and 2023. Net unrealized gains on available-for-sale debt securities were insignificant in the six months ended June 30, 2024 and 2023. Cumulative unrealized losses on available-for-sale debt securities were $144 million and $160 million at June 30, 2024 and December 31, 2023.

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheet to the total shown in the condensed consolidated statement of cash flows:
June 30, 2024
Cash and cash equivalents$22,516 
Restricted cash included in Other current assets2,652 
Restricted cash included in Other assets452 
Total$25,620