Investments (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2022	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair values
U.S. Treasury notes	$	—	$	—	$	—	$	—
U.S. Treasury bills	1,980		—		—		1,980
Money market mutual funds	4,433		—		—		4,433
Other short-term interest-bearing securities	—		—		—		—
Total interest-bearing securities	$	6,413	$	—	$	—	$	6,413

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	June 30, 2022		December 31, 2021
Cash and cash equivalents	$	4,433	$	7,256
Marketable securities	1,980		48
Total interest-bearing securities	$	6,413	$	7,304