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EMPLOYEE RETIREMENT PLANS - Other and Cash Flows (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Qualified |  |
Employee Retirement Plans |  |
Contribution to qualified defined-benefit pension plans | $ 140 |
Payments to participants defined-benefit pension plans | 895 |
Non-Qualified |  |
Employee Retirement Plans |  |
Payments to participants defined-benefit pension plans | 12 |
International |  |
Employee Retirement Plans |  |
Payments to participants defined-benefit pension plans | 1 |
Defined-contribution plans |  |
Employee Retirement Plans |  |
Aggregate present value of unfunded accumulated post-retirement benefit obligation | $ 10 | $ 10

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