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PENSION AND POSTRETIREMENT BENEFIT PLANS - Obligations and Funded Status of our Defined Benefit Plans (Details) - USD ($) $ in Millions | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amounts recognized on the balance sheet |  |  |  |
Amounts recognized in accumulated other comprehensive loss |  | $ (23) |  |
Pension Benefits |  |  |  |
Amounts recognized on the balance sheet |  |  |  |
Accrued liabilities | $ 0 |  | $ 0 |
Other long-term liabilities | (15) |  | (18) |
Amounts recognized in the consolidated balance sheets, total | (15) |  | (18) |
Amounts recognized in accumulated other comprehensive loss | (1) |  | (6) |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation—beginning balance | 46 | 45 | 56 |
Service cost—benefits earned during the period | 0 | 1 | 1 | $ 1
Interest cost on projected benefit obligation | 0 | 1 | 2 | 2
Actuarial loss (gain) | 3 | 1 | 11 |
Benefits paid | (2) | (2) | (25) |
Benefit obligation—beginning balance | 47 | 46 | 45 | 56
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets—beginning balance | 26 | 27 | 42 |
Actual gain (loss) return on plan assets | 2 | 1 | 7 |
Employer contributions | 6 | 0 | 3 |
Benefits paid | (2) | (2) | (25) |
Fair value of plan assets—ending balance | 32 | 26 | 27 | 42
Net benefit liability (unfunded status) | (15) | (20) | (18) |
Postretirement Benefits |  |  |  |
Amounts recognized on the balance sheet |  |  |  |
Accrued liabilities | (4) |  | (3) |
Other long-term liabilities | (125) |  | (113) |
Amounts recognized in the consolidated balance sheets, total | (129) |  | (116) |
Amounts recognized in accumulated other comprehensive loss | (7) |  | (17) |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation—beginning balance | 122 | 116 | 84 |
Service cost—benefits earned during the period | 1 | 4 | 4 | 4
Interest cost on projected benefit obligation | 0 | 3 | 4 | 4
Actuarial loss (gain) | 7 | 2 | 19 |
Cost of special termination benefits | 0 | 0 | 6 | 0
Curtailment | 0 | 0 | 2 |
Benefits paid | (1) | (3) | (3) |
Benefit obligation—beginning balance | 129 | 122 | 116 | 84
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Fair value of plan assets—beginning balance | 0 | 0 | 0 |
Employer contributions | 1 | 3 | 3 |
Benefits paid | (1) | (3) | (3) |
Fair value of plan assets—ending balance | 0 | 0 | 0 | $ 0
Net benefit liability (unfunded status) | $ (129) | $ (122) | $ (116) |

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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