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CASH AND INVESTMENTS - Changes in Level 3 Instruments Measured on a Recurring Basis (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 13 | $ 32
Transfers into (out of) Level 3 | 0 | 0
Net realized and unrealized gains (losses): |  |
Included in earnings (in investment income) | (7) | (19)
Included in accumulated other comprehensive income (pre-tax) | 0 | 0
Purchases | 0 | 0
Settlements | 0 | 0
Ending Balance | 6 | 13
Marketable securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 0 | 0
Transfers into (out of) Level 3 | 0 | 0
Net realized and unrealized gains (losses): |  |
Included in earnings (in investment income) | 0 | 0
Included in accumulated other comprehensive income (pre-tax) | 0 | 0
Purchases | 0 | 0
Settlements | 0 | 0
Ending Balance | 0 | 0
Other Long-term Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 13 | 32
Transfers into (out of) Level 3 | 0 | 0
Net realized and unrealized gains (losses): |  |
Included in earnings (in investment income) | (7) | (19)
Included in accumulated other comprehensive income (pre-tax) | 0 | 0
Purchases | 0 | 0
Settlements | 0 | 0
Ending Balance | $ 6 | $ 13

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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