Valuation of Debt and Equity Investments and Certain Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Details of our investments are as follows:


	December 31, 2019										December 31, 2018
	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	$	1,213	$	—	$	—	$	747	$	—	$	—
Corporate obligations	174		1,216		—		473		748		—
U.S. government agency and Treasury securities	604		1,734		—		988		1,047		—
Trading securities:
Mutual funds	—		—		272		—		—		226
Total	1,991		2,950		272		2,208		1,795		226

Other measurement basis:
Equity-method investments	—		—		24		—		—		21
Non-marketable equity investments	—		—		4		—		—		4
Cash on hand	446		—		—		230		—		—
Total	$	2,437	$	2,950	$	300	$	2,438	$	1,795	$	251

Aggregate Maturities of Available-for-sale Debt Investments

The following table presents the aggregate maturities of our available-for-sale debt investments as of December 31, 2019:


	Fair Value
One year or less	$	4,921
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.


	December 31, 2019										December 31, 2018
	Level 1		Level 2		Total		Level 1		Level 2		Total
Assets:
Money market funds	$	1,213	$	—	$	1,213	$	747	$	—	$	747
Corporate obligations	—		1,390		1,390		—		1,221		1,221
U.S. government agency and Treasury securities	2,338		—		2,338		2,035		—		2,035
Mutual funds	272		—		272		226		—		226
Total assets	$	3,823	$	1,390	$	5,213	$	3,008	$	1,221	$	4,229

Liabilities:
Deferred compensation	$	298	$	—	$	298	$	246	$	—	$	246
Total liabilities	$	298	$	—	$	298	$	246	$	—	$	246