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Investments - (Tables)
 12 Months Ended
Dec. 31, 2022
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 December 31, 2022Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
values
U.S. Treasury notes$— $— $— $— 
U.S. Treasury bills1,676 — — 1,676 
Money market mutual funds2,659 — — 2,659 
Other short-term interest-bearing securities— — — — 
Total available-for-sale investments$4,335 $— $— $4,335 
Types of securities as of December 31, 2021Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
values
U.S. Treasury notes$47 $— $— $47 
U.S. Treasury bills1,400 — — 1,400 
Money market mutual funds5,856 — — 5,856 
Other short-term interest-bearing securities1 — — 1 
Total available-for-sale investments$7,304 $— $— $7,304 
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
The fair values of available-for-sale investments by location in the Consolidated Balance Sheets were as follows (in millions):
December 31,
Consolidated Balance Sheets locations20222021
Cash and cash equivalents$2,659 $7,256 
Marketable securities1,676 48 
Total available-for-sale investments$4,335 $7,304