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CASH AND INVESTMENTS - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gain (Loss) on Securities [Line Items] |  |  |
Marketable securities pledged as collateral | $ 587,000,000 | $ 579,000,000 |
Debt Securities, Trading, and Equity Securities, FV-NI | 139,000,000 | 168,000,000 |
Gross realized gains on sales of marketable securities |  |  | $ 1,000,000
Gross realized losses on sales of marketable securities | 4,000,000 | 2,000,000 | 1,000,000
Impairment charge | 0 | 0 | $ 0
Investments and Restricted Cash | 170,000,000 | 483,000,000 |
Variable Life Insurance Policy [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Investments and Restricted Cash | 19,000,000 |  |
cash held in escrow [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Restricted Cash and Cash Equivalents, Noncurrent | $ 9,000,000 | $ 15,000,000 |
Measurement Input, Discount Rate [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Weighted average discount rate | 8.16% | 7.56% |

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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
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