Valuation of debt and equity investments and certain liabilities (Tables)

3 Months Ended

Mar. 31, 2020

Details of our investments are as follows:


	March 31, 2020										December 31, 2019
	Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Measured at fair value:
Available-for-sale debt securities:
Money market funds	$	1,912	$	—	$	—	$	1,213	$	—	$	—
Corporate obligations	102		899		—		174		1,216		—
U.S. government agency and Treasury securities	150		1,325		—		604		1,734		—
Trading securities:
Mutual funds	—		—		14		—		—		272
Total	2,164		2,224		14		1,991		2,950		272

Other measurement basis:
Equity-method investments	—		—		16		—		—		24
Non-marketable equity investments	—		—		4		—		—		4
Cash on hand	354		—		—		446		—		—
Total	$	2,518	$	2,224	$	34	$	2,437	$	2,950	$	300

Aggregate Maturities of Available-for-sale Debt Investments

The following table presents the aggregate maturities of our available-for-sale debt investments as of March 31, 2020:


	Fair Value
One year or less	$	4,368
One to two years	20

Assets and Liabilities Accounted for at Fair Value

The following are our assets and liabilities that were accounted for at fair value on a recurring basis. These tables do not include cash on hand, assets held by our postretirement plans, or assets and liabilities that are measured at historical cost or any basis other than fair value.


	March 31, 2020										December 31, 2019
	Level 1		Level 2		Total		Level 1		Level 2		Total
Assets:
Money market funds	$	1,912	$	—	$	1,912	$	1,213	$	—	$	1,213
Corporate obligations	—		1,001		1,001		—		1,390		1,390
U.S. government agency and Treasury securities	1,475		—		1,475		2,338		—		2,338
Mutual funds	14		—		14		272		—		272
Total assets	$	3,401	$	1,001	$	4,402	$	3,823	$	1,390	$	5,213

Liabilities:
Deferred compensation	$	251	$	—	$	251	$	298	$	—	$	298
Total liabilities	$	251	$	—	$	251	$	298	$	—	$	298