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Non-marketable Equity Securities
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Non-marketable Equity Securities Non-marketable Equity Securities
Our non-marketable equity securities are investments in privately-held companies without readily determinable fair values. The following table summarizes our non-marketable equity securities that were measured using measurement alternative or equity method (in millions):

September 30, 2024December 31, 2023
Non-marketable equity securities under measurement alternative:
Initial cost$6,341 $6,389 
Cumulative upward adjustments300 293 
Cumulative impairment/downward adjustments(623)(599)
Carrying value6,018 6,083 
Non-marketable equity securities under equity method53 58 
Total$6,071 $6,141