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

12 Months Ended

Dec. 31, 2014

Details of our investments are as follows:



	December 31, 2014						December 31, 2013
	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 securities
Money market funds	$	522	$	—	$	—	$	500	$	—	$	—
Corporate obligations	97		390		—		123		217		—
U.S. Government agency and Treasury securities	365		1,952		—		787		1,985		—
Trading securities
Mutual funds	—		—		185		—		—		179
Total	984		2,342		185		1,410		2,202		179

Other measurement basis:
Equity-method investments	—		—		27		—		—		24
Cost-method investments	—		—		12		—		—		13
Cash on hand	215		—		—		217		—		—
Total	$	1,199	$	2,342	$	224	$	1,627	$	2,202	$	216

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 at December 31, 2014:



Due	Fair Value
One year or less	$	3,121
One to two years	205

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 December 31, 2014 and 2013. We had no Level 3 assets or liabilities as of December 31, 2014 and 2013. 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 December 31, 2014		Level 1		Level 2
Assets:
Money market funds	$	522	$	522	$	—
Corporate obligations	487		—		487
U.S. Government agency and Treasury securities	2,317		1,762		555
Mutual funds	185		185		—
Total assets	$	3,511	$	2,469	$	1,042

Liabilities:
Deferred compensation	$	202	$	202	$	—
Total liabilities	$	202	$	202	$	—



	Fair Value December 31, 2013		Level 1		Level 2
Assets:
Money market funds	$	500	$	500	$	—
Corporate obligations	340		—		340
U.S. Government agency and Treasury securities	2,772		2,107		665
Mutual funds	179		179		—
Total assets	$	3,791	$	2,786	$	1,005

Liabilities:
Deferred compensation	$	197	$	197	$	—
Total liabilities	$	197	$	197	$	—

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

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