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INCOME TAXES (Reserve for unrecognized tax benefits, interest and penalties) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance at beginning of year | $ 404 | $ 390 | $ 101
Additions: |  |  |
Prior year tax positions | 73 | 100 | 302
Current year tax positions | 11 | 14 | 6
Decreases: |  |  |
Prior year tax positions | (75) | (86) | (1)
Settlements with taxing authorities | (37) | (9) | (17)
Lapse of statute of limitations | 0 | (5) | (1)
Balance at end of year | $ 376 | $ 404 | $ 390

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- Definition Unrecognized Tax Benefits, Decreases + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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