Investments (Tables)

9 Months Ended

Sep. 30, 2020

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, 2020	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair values
U.S. Treasury notes	$	172	$	2	$	—	$	174
U.S. Treasury bills	6,399		—		—		6,399
Corporate debt securities:
Financial	—		—		—		—
Industrial	—		—		—		—
Other	—		—		—		—
Residential-mortgage-backed securities	—		—		—		—
Money market mutual funds	5,016		—		—		5,016
Other short-term interest-bearing securities	—		—		—		—
Total interest-bearing securities	$	11,587	$	2	$	—	$	11,589

Types of securities as of December 31, 2019	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair values
U.S. Treasury notes	$	359	$	1	$	—	$	360
U.S. Treasury bills	—		—		—		—
Corporate debt securities:
Financial	1,108		13		—		1,121
Industrial	824		10		—		834
Other	195		3		—		198
Residential-mortgage-backed securities	181		1		—		182
Money market mutual funds	5,250		—		—		5,250
Other short-term interest-bearing securities	289		—		—		289
Total interest-bearing securities	$	8,206	$	28	$	—	$	8,234

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	September 30, 2020		December 31, 2019
Cash and cash equivalents	$	8,316	$	5,360
Marketable securities	3,273		2,874
Total interest-bearing securities	$	11,589	$	8,234

Fair values of available-for-sale interest-bearing security investments by contractual maturity

The fair values of interest-bearing securities by contractual maturity, except for residential-mortgage-backed securities that do not have a single maturity date, were as follows (in millions):

Contractual maturities	September 30, 2020		December 31, 2019
Maturing in one year or less	$	11,536	$	5,629
Maturing after one year through three years	53		2,304
Maturing after three years through five years	—		119
Residential-mortgage-backed securities	—		182
Total interest-bearing securities	$	11,589	$	8,234