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Investments (Tables)
 6 Months Ended
Jun. 30, 2021
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 June 30, 2021Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
values
U.S. Treasury notes$51 $1 $— $52 
U.S. Treasury bills1,400 — — 1,400 
Money market mutual funds5,707 — — 5,707 
Other short-term interest-bearing securities— — — — 
Total interest-bearing securities$7,158 $1 $— $7,159 

Types of securities as of December 31, 2020Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
values
U.S. Treasury notes$129 $1 $— $130 
U.S. Treasury bills4,948 — — 4,948 
Money market mutual funds4,765 — — 4,765 
Other short-term interest-bearing securities2 — — 2 
Total interest-bearing securities$9,844 $1 $— $9,845 
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 locationsJune 30, 2021December 31, 2020
Cash and cash equivalents$5,707 $5,464 
Marketable securities1,452 4,381 
Total interest-bearing securities$7,159 $9,845 
Fair values of available-for-sale interest-bearing security investments by contractual maturity
The fair values of available-for-sale investments by contractual maturity were as follows (in millions):
Contractual maturitiesJune 30, 2021December 31, 2020
Maturing in one year or less$7,159 $9,795 
Maturing after one year through three years— 50 
Total available-for-sale investments $7,159 $9,845