Investments (Tables)

3 Months Ended

Mar. 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 March 31, 2022	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair values
U.S. Treasury notes	$	16	$	—	$	—	$	16
U.S. Treasury bills	—		—		—		—
Money market mutual funds	5,837		—		—		5,837
Other short-term interest-bearing securities	—		—		—		—
Total interest-bearing securities	$	5,853	$	—	$	—	$	5,853

Types of securities as of December 31, 2021	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair values
U.S. Treasury notes	$	47	$	—	$	—	$	47
U.S. Treasury bills	1,400		—		—		1,400
Money market mutual funds	5,856		—		—		5,856
Other short-term interest-bearing securities	1		—		—		1
Total interest-bearing securities	$	7,304	$	—	$	—	$	7,304

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 locations	March 31, 2022		December 31, 2021
Cash and cash equivalents	$	5,837	$	7,256
Marketable securities	16		48
Total interest-bearing securities	$	5,853	$	7,304

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 maturities	March 31, 2022		December 31, 2021
Maturing in one year or less	$	5,853	$	7,304
Total available-for-sale investments	$	5,853	$	7,304