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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Balance at Beginning of Period | $ 10 |  |
Balance at End of Period |  | $ 10 |
Allowance for doubtful accounts, deducted from accounts receivable |  |  |
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Balance at Beginning of Period | 29 | 21 | $ 21
Charged to Costs and Expenses | 56 | 47 | 62
Charged to Other Accounts | 0 | 0 | 0
Deductions | (57) | (39) | (62)
Balance at End of Period | 28 | 29 | 21
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Balance at Beginning of Period | 4,116 | 3,575 | 265
Charged to Costs and Expenses | (151) | 306 | 3,039
Charged to Other Accounts | (15) | 235 | 271
Deductions | (2,087) | 0 | 0
Balance at End of Period | 1,863 | 4,116 | 3,575
Income tax valuation allowance, deducted from deferred tax assets | Discontinued Operations |  |  |
Income tax valuation allowance, deducted from deferred tax assets |  |  |
Balance at Beginning of Period | $ 2,087 | 2,194 |
Balance at End of Period |  | $ 2,087 | $ 2,194

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to accounts other than costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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