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PENSION AND OTHER POSTRETIREMENT BENEFITS - Additional Information (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Jun. 28, 2019 | Jun. 29, 2018 | Jun. 30, 2017 | Jun. 25, 2028 | Jun. 25, 2027 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Matching contributions charged to expense |  | $ 85,000,000 | $ 83,000,000 | $ 80,000,000 |  |  |
Fair value of plan assets |  | 5,159,000,000 | 5,305,000,000 | 5,133,000,000 |  |  |
Projected benefit obligation |  | 6,344,000,000 | 6,007,000,000 | 6,405,000,000 |  |  |
Accumulated benefit obligation for all defined benefit pension plans |  | $ 6,100,000,000 |  |  |  |  |
Per capita cost of healthcare assumed for next fiscal year, pre-age 65 |  | 7.35% |  |  |  |  |
Per capita cost of healthcare assumed for next fiscal year, post-age 65 |  | 6.85% |  |  |  |  |
Voluntary contributions by employer to pension plan |  | $ 5,000,000 | 302,000,000 |  |  |  |
Hedge funds |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Defined benefit plans, future unfunded commitments on NAV equity funds investments |  | $ 0 | 0 |  |  |  |
Minimum redemption notice period permitted on NAV equity funds investments |  | 90 days |  |  |  |  |
Private equity funds |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Defined benefit plans, future unfunded commitments on NAV equity funds investments |  | $ 355,000,000 | 246,000,000 |  |  |  |
Forecast |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Per capita cost of healthcare assumed for next fiscal year, pre-age 65 | 7.00% |  |  |  |  |  |
Per capita cost of healthcare assumed for next fiscal year, post-age 65 | 6.55% |  |  |  |  |  |
Ultimate per capita cost of healthcare assumed (percent) |  |  |  |  |  | 4.75% |
Per capita cost of healthcare assumed for next fiscal year (percent) |  |  |  |  | 4.75% |  |
Pension |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Fair value of plan assets |  | 4,958,000,000 | 5,098,000,000 | 4,921,000,000 |  |  |
Projected benefit obligation |  | $ 6,123,000,000 | $ 5,774,000,000 | $ 6,140,000,000 |  |  |
Discount rate (percent) |  | 3.35% | 4.05% |  |  |  |
Expected return on plan assets |  | 7.66% | 7.66% | 7.65% |  |  |
Voluntary contributions by employer to pension plan |  | $ 3,000,000 | $ 303,000,000 |  |  |  |
Pension | Forecast |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Expected return on plan assets | 7.67% |  |  |  |  |  |
United States |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Fair value of plan assets |  | 4,400,000,000 |  |  |  |  |
Projected benefit obligation |  | $ 5,500,000,000 |  |  |  |  |
Cash balance benefit percentage |  |  |  |  |  |  | 1.00%
Percentage of total projected benefit obligation (percent) |  | 90.27% |  |  |  |  |
Discount rate (percent) |  | 3.37% |  |  |  |  |
Expected return on plan assets |  | 7.75% |  |  |  |  |
United States | Forecast |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Expected return on plan assets | 7.75% |  |  |  |  |  |
United States | Pension |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Voluntary contributions by employer to pension plan |  |  | $ 300,000,000 | $ 400,000,000 |  |  |
United States | Pension | Harris U.S. Qualified Pension Plans |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Anticipated contributions to qualified pension plans |  | $ 2,000,000 |  |  |  |  |
United States | Pension | L3 U.S. Qualified Pension Plans |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Anticipated contributions to qualified pension plans |  | $ 23,000,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Percentage match of the employee contribution |  | 2.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Percentage match of the employee contribution |  | 6.00% |  |  |  |  |

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