Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Investment
Cash	$ 112	$ 71
Cash equivalents:
Cash and cash equivalents, adjusted cost	2,008	286
Cash and cash equivalents, fair value disclosure	2,008	286
Restricted Cash, adjusted cost	7	23
Restricted Cash, Fair Value	7	23
U.S. and Canadian government obligations
Cash equivalents:
Cash equivalents, adjusted cost	1,873	190
Cash equivalents, fair value	1,873	190
Other debt securities
Cash equivalents:
Cash equivalents, adjusted cost	23	25
Cash equivalents, fair value	23	25
Nonqualified employee benefit trusts
Cash equivalents:
Available-for-sale securities, adjusted cost	18	18
Available-for-sale securities, gross unrealized gain	1	1
Available-for-sale securities, fair value	$ 19	$ 19

Represents the adjusted cost of cash equivalents, that are considered as available-for-sale and recorded at fair value.

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Cash Equivalents, at Fair Value

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Cash and Cash Equivalents, Adjusted Cost

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Represents fair value of restricted cash.

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Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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-Publisher SEC
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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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-Publisher FASB
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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