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OTHER FINANCIAL INFORMATION - OTHER FINANCIAL INFORMATION (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 1,360 | $ 1,400
Unsecured Debt [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | 500 |
Unsecured Debt [Member] | 2024 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 350 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Details
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- Details
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