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EMPLOYEE BENEFIT PLANS (Reconciliation of Changes in Plan Assets Benefit Obligations and Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Funded Status: |  |  |
Noncurrent liability | $ (231) | $ (860) |
Pension Plan |  |  |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 21,895 | 20,759 |
Actual return on plan assets | (4,916) | 1,693 |
Company contributions | 339 | 335 |
Benefits and expenses paid | (949) | (892) |
Fair value of plan assets at end of year | 16,369 | 21,895 | $ 20,759
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 22,759 | 23,172 |
Service cost for benefits earned | 575 | 587 | 530
Interest cost | 692 | 645 | 713
Actuarial gain | (6,471) | (752) |
Plan amendments | 0 | 0 |
Benefits and expenses paid | (947) | (893) |
Benefit obligation at end of year | 16,608 | 22,759 | 23,172
Funded Status: |  |  |
Current liability | (8) | (9) |
Noncurrent liability | (231) | (856) |
Net (liability) asset at end of year | (239) | (865) |
Accumulated benefit obligation | 15,400 | 20,400 |
PBOP Plans |  |  |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 3,102 | 2,995 |
Actual return on plan assets | (693) | 193 |
Company contributions | 26 | 10 |
Plan participant contribution | 81 | 80 |
Benefits and expenses paid | (180) | (176) |
Fair value of plan assets at end of year | 2,336 | 3,102 | 2,995
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 1,766 | 1,876 |
Service cost for benefits earned | 62 | 63 | 61
Interest cost | 53 | 51 | 63
Actuarial gain | (486) | (152) |
Benefits and expenses paid | (162) | (156) |
Federal subsidy on benefits paid | 3 | 4 |
Plan participant contributions | 81 | 80 |
VSP related termination benefits | 22 | 0 |
Benefit obligation at end of year | 1,339 | 1,766 | $ 1,876
Funded Status: |  |  |
Noncurrent asset | 997 | 1,340 |
Noncurrent liability | 0 | (4) |
Net (liability) asset at end of year | 997 | 1,336 |
PBOP Plans | Postretirement Life Insurance Plan |  |  |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 359 |  |
Fair value of plan assets at end of year | 266 | 359 |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 363 |  |
Benefit obligation at end of year | $ 259 | $ 363 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + 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 https://asc.fasb.org/extlink&oid=123447040&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 https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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