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INCOME TAXES - Summarized Activity Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tax |  |  |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Beginning Balance | $ 172 | $ 167 | $ 160
Additions for tax positions of the current year | 61 | 6 | 47
Additions for tax positions of prior years | 154 | 51 | 7
Reductions for tax positions of prior years for: |  |  |
Changes based on facts and circumstances | (54) | (45) | (43)
Settlements during the period | 0 | (3) | (1)
Lapses of applicable statute of limitations | 0 | (4) | (3)
Ending Balance | 333 | 172 | 167
Interest |  |  |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Beginning Balance | 52 | 44 | 43
Additions for tax positions of the current year | 0 | 0 | 0
Additions for tax positions of prior years | 34 | 13 | 10
Reductions for tax positions of prior years for: |  |  |
Changes based on facts and circumstances | (24) | (4) | (8)
Settlements during the period | (1) | (1) | (1)
Lapses of applicable statute of limitations | 0 | 0 | 0
Ending Balance | 61 | 52 | 44
Penalties |  |  |
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Beginning Balance | 4 | 5 | 9
Additions for tax positions of the current year | 0 | 0 | 1
Additions for tax positions of prior years | 2 | 0 | 0
Reductions for tax positions of prior years for: |  |  |
Changes based on facts and circumstances | (2) | (1) | (5)
Settlements during the period | 0 | 0 | 0
Lapses of applicable statute of limitations | 0 | 0 | 0
Ending Balance | $ 4 | $ 4 | $ 5

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- Definition Unrecognized Tax Benefits Reductions Resulting From Changes Based On Facts And Circumstances + 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=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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