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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - OBLIGATIONS AND FUNDED STATUS (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Amounts recognized in the consolidated balance sheet: |  |  |  |
Deferred credits and other liabilities — pension and postretirement obligations |  | $ (1,540) | $ (1,763) |
Pension Benefits |  |  |  |
Amounts recognized in the consolidated balance sheet: |  |  |  |
Long-term receivables and other assets, net |  | 192 | 167 |
Accrued liabilities |  | (4) | (9) |
Deferred credits and other liabilities — pension and postretirement obligations |  | (391) | (578) |
Total amount recognized in consolidated balance sheet |  | (203) | (420) |
Accumulated other comprehensive loss included the following after-tax balances: |  |  |  |
Net loss |  | (17) | (3) |
Prior service cost |  | 0 | 0 |
AOCI after-tax balances |  | (17) | (3) |
Changes in the benefit obligation: |  |  |  |
Benefit obligation — beginning of year |  | 1,613 | 2,508 |
Service cost — benefits earned during the period |  | 8 | 37 | $ 47
Interest cost on projected benefit obligation |  | 35 | 52 | 40
Actuarial (gain) loss |  | (55) | 251 |
Curtailment (gain) loss | $ (124) | 0 | (278) |
Special termination benefits |  | 0 | 23 |
Benefits paid |  | (219) | (948) |
Sale of Colombia assets |  | 0 | (24) |
Settlement due to annuity purchase |  | (109) | 0 |
Other | $ (278) | 0 | (8) |
Benefit obligation — end of year |  | 1,273 | 1,613 | 2,508
Changes in plan assets: |  |  |  |
Fair value of plan assets — beginning of year |  | 1,193 | 1,841 |
Actual return on plan assets |  | 44 | 161 |
Employer contributions |  | 162 | 146 |
Benefits paid |  | (219) | (948) |
Payments due to annuity purchase |  | (109) | 0 |
Other |  | (1) | (7) |
Fair value of plan assets — end of year |  | 1,070 | 1,193 | 1,841
Unfunded status: |  | (203) | (420) |
Accumulated Benefit Obligation in Excess of Plan Assets |  |  |  |
Projected benefit obligation |  | 963 | 1,226 |
Accumulated benefit obligation |  | 960 | 1,221 |
Fair value of plan assets |  | 656 | 670 |
Plan Assets in Excess of Accumulated Benefit Obligation |  |  |  |
Projected benefit obligation |  | 310 | 387 |
Accumulated benefit obligation |  | 308 | 379 |
Fair value of plan assets |  | 414 | 523 |
Postretirement Benefits |  |  |  |
Amounts recognized in the consolidated balance sheet: |  |  |  |
Long-term receivables and other assets, net |  | 0 | 0 |
Accrued liabilities |  | (71) | (74) |
Deferred credits and other liabilities — pension and postretirement obligations |  | (1,149) | (1,185) |
Total amount recognized in consolidated balance sheet |  | (1,220) | (1,259) |
Accumulated other comprehensive loss included the following after-tax balances: |  |  |  |
Net loss |  | 163 | 226 |
Prior service cost |  | (50) | (60) |
AOCI after-tax balances |  | 113 | 166 |
Changes in the benefit obligation: |  |  |  |
Benefit obligation — beginning of year |  | 1,259 | 1,175 |
Service cost — benefits earned during the period |  | 42 | 39 | 24
Interest cost on projected benefit obligation |  | 33 | 37 | 36
Actuarial (gain) loss |  | (54) | 73 |
Curtailment (gain) loss |  | 0 | 2 |
Special termination benefits |  | 0 | 0 |
Benefits paid |  | (67) | (73) |
Sale of Colombia assets |  | 0 | 0 |
Settlement due to annuity purchase |  | 0 | 0 |
Other |  | 7 | 6 |
Benefit obligation — end of year |  | 1,220 | 1,259 | 1,175
Changes in plan assets: |  |  |  |
Fair value of plan assets — beginning of year |  | 0 | 0 |
Actual return on plan assets |  | 0 | 0 |
Employer contributions |  | 59 | 67 |
Benefits paid |  | (67) | (73) |
Payments due to annuity purchase |  | 0 | 0 |
Other |  | 8 | 6 |
Fair value of plan assets — end of year |  | 0 | 0 | $ 0
Unfunded status: |  | $ (1,220) | $ (1,259) |

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- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 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=123450688&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. 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 (b)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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)(8) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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