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Investments (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
The amortized cost, gross unrealized gains, gross unrealized losses and fair values of interest-bearing securities, which are considered available-for-sale, by type of security were as follows (in millions):
Types of securities as of September 30, 2023Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
values
U.S. Treasury bills$— $— $— $— 
Money market mutual funds34,208 — — 34,208 
Total interest-bearing securities$34,208 $— $— $34,208 

Types of securities as of December 31, 2022Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
values
U.S. Treasury bills$1,676 $— $— $1,676 
Money market mutual funds2,659 — — 2,659 
Total interest-bearing securities$4,335 $— $— $4,335 
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
The fair values of interest-bearing securities by location in the Condensed Consolidated Balance Sheets were as follows (in millions):
Condensed Consolidated Balance Sheets locationsSeptember 30, 2023December 31, 2022
Cash and cash equivalents$34,208 $2,659 
Marketable securities— 1,676 
Total interest-bearing securities$34,208 $4,335