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PENSION AND OTHER POSTRETIREMENT BENEFITS - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions | Jan. 03, 2020 | Jun. 28, 2019 | Jun. 29, 2018 | Jun. 30, 2017
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | $ 8,892 | $ 5,159 | $ 5,305 |
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 8,618 | 4,958 | 5,098 | $ 4,921
Projected benefit obligation | (10,268) | (6,123) | (5,774) | (6,140)
Funded status | (1,650) | (1,165) | (676) |
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 274 | 201 | 207 | 212
Projected benefit obligation | (369) | (221) | (233) | $ (265)
Funded status | (95) | (20) | (26) |
Other non-current assets | Pension |  |  |  |
Consolidated Balance Sheet line item amounts: |  |  |  |
Defined benefit plans, current assets | 91 | 12 | 15 |
Other non-current assets | Other Benefits |  |  |  |
Consolidated Balance Sheet line item amounts: |  |  |  |
Defined benefit plans, current assets | 1 | 0 | 0 |
Compensation and benefits | Pension |  |  |  |
Consolidated Balance Sheet line item amounts: |  |  |  |
Defined benefit plan liabilities, current | (10) | (7) | (2) |
Compensation and benefits | Other Benefits |  |  |  |
Consolidated Balance Sheet line item amounts: |  |  |  |
Defined benefit plan liabilities, current | (8) | 0 | (1) |
Liabilities of disposal group held for sale | Pension |  |  |  |
Consolidated Balance Sheet line item amounts: |  |  |  |
Defined benefit plan liabilities, current | 0 | (16) | 0 |
Liabilities of disposal group held for sale | Other Benefits |  |  |  |
Consolidated Balance Sheet line item amounts: |  |  |  |
Defined benefit plan liabilities, current | 0 | 0 | 0 |
Defined benefit plans | Pension |  |  |  |
Consolidated Balance Sheet line item amounts: |  |  |  |
Defined benefit plans liabilities, noncurrent | (1,731) | (1,154) | (689) |
Defined benefit plans | Other Benefits |  |  |  |
Consolidated Balance Sheet line item amounts: |  |  |  |
Defined benefit plans liabilities, noncurrent | $ (88) | $ (20) | $ (25) |

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