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

6 Months Ended

Jun. 30, 2016

Details of our investments are as follows:

	June 30, 2016						December 31, 2015
	Cash and Cash		Short-Term		Long-Term		Cash and Cash		Short-Term		Long-Term
	Equivalents		Investments		Investments		Equivalents		Investments		Investments
Measured at fair value:
Available-for-sale securities:
Money market funds	$	533	$	—	$	—	$	395	$	—	$	—
Corporate obligations		102		325		—		132		285		—
U.S. Government agency and Treasury securities		395		979		—		245		1,933		—
Trading securities:
Mutual funds		—		—		190		—		—		187
Total		1,030		1,304		190		772		2,218		187

Other measurement basis:
Equity-method investments		—		—		25		—		—		25
Cost-method investments		—		—		9		—		—		9
Cash on hand		205		—		—		228		—		—
Total	$	1,235	$	1,304	$	224	$	1,000	$	2,218	$	221

Aggregate Maturities of Investments in Debt Securities Classified as Available-for-sale

The following table presents the aggregate maturities of investments in debt securities classified as available for sale as of June 30, 2016:

Due	Fair Value
One year or less	$	2,304
One to two years		30

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 as of June 30, 2016, and December 31, 2015. 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.

	Fair Value
	June 30, 2016						December 31, 2015
	Total		Level 1		Level 2		Total		Level 1		Level 2
Assets:
Money market funds	$	533	$	533	$	—	$	395	$	395	$	—
Corporate obligations		427		—		427		417		—		417
U.S. Government agency and Treasury securities		1,374		1,114		260		2,178		1,828		350
Mutual funds		190		190		—		187		187		—
Total assets	$	2,524	$	1,837	$	687	$	3,177	$	2,410	$	767

Liabilities:
Deferred compensation	$	206	$	206	$	—	$	198	$	198	$	—
Total liabilities	$	206	$	206	$	—	$	198	$	198	$	—