CASH AND INVESTMENTS - Additional Information (Detail) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Gain (Loss) on Investments [Line Items] | |||
| Marketable securities pledged as collateral | $ 579,000,000 | $ 572,000,000 | |
| Trading Securities | 168,000,000 | 517,000,000 | |
| Gross realized gains on sales of marketable securities | 0 | 1,000,000 | $ 1,000,000 |
| Gross realized losses on sales of marketable securities | 2,000,000 | 1,000,000 | 1,000,000 |
| Impairment charge | 0 | 0 | $ 0 |
| Investments and Restricted Cash | $ 483,000,000 | $ 476,000,000 | |
| Weighted average discount rate | 7.56% | 8.06% | |
| Variable Life Insurance Policy [Member] | |||
| Gain (Loss) on Investments [Line Items] | |||
| Investments and Restricted Cash | $ 19,000,000 | $ 18,000,000 | |
| Self Insurance Program [Member] | |||
| Gain (Loss) on Investments [Line Items] | |||
| Investments and Restricted Cash | 449,000,000 | 445,000,000 | |
| cash held in escrow [Member] | |||
| Gain (Loss) on Investments [Line Items] | |||
| Investments and Restricted Cash | $ 15,000,000 | $ 13,000,000 | |
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- Definition Marketable Securities, Gross Realized Gains No definition available.
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- Definition Marketable Securities, Gross Realized Losses No definition available.
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. No definition available.
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- Definition Line items represent financial 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. No definition available.
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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