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PENSION AND OTHER POSTRETIREMENT BENEFITS - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 30, 2018 | Jun. 28, 2019 | Jun. 29, 2018 | Jun. 30, 2017 | Jul. 01, 2016 | Jun. 25, 2028 | Jun. 25, 2027 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Percentage match of the employee contribution - Low end of range (percent) |  |  | 2.00% |  |  |  |  |
Percentage match of the employee contribution - High end of range (percent) |  |  | 6.00% |  |  |  |  |
Matching contributions charged to expense |  |  | $ 83 | $ 80 | $ 82 |  |  |
Fair value of plan assets |  |  | 5,305 | 5,133 | 4,489 |  |  |
Projected benefit obligation |  |  | 6,007 | 6,405 | 6,782 |  |  |
Accumulated benefit obligation for all defined benefit pension plans |  |  | $ 5,800 |  |  |  |  |
Per capita cost of healthcare assumed for next fiscal year, pre-age 65 |  |  | 6.88% |  |  |  |  |
Per capita cost of healthcare assumed for next fiscal year, post-age 65 |  |  | 6.88% |  |  |  |  |
Voluntary contributions by employer to pension plan |  |  | $ 302 | 587 |  |  |  |
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 |  |  | $ 246 | 157 |  |  |  |
Hedge funds |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Redemption period permitted on NAV equity funds investments |  |  | 90 days |  |  |  |  |
Scenario, 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 |  |  |  |  |  | 7.35% |  |
Per capita cost of healthcare assumed for next fiscal year, post-age 65 |  |  |  |  |  | 6.85% |  |
Per capita cost of healthcare assumed for next fiscal year (percent) |  |  |  |  |  | 4.75% |  |
Ultimate per capita cost of healthcare assumed (percent) |  |  |  |  |  |  | 4.75% |
Pension |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Fair value of plan assets |  |  | $ 5,098 | 4,921 | 4,273 |  |  |
Projected benefit obligation |  |  | $ 5,774 | $ 6,140 | $ 6,471 |  |  |
Discount rate (percent) |  |  | 4.05% | 3.76% |  |  |  |
Expected return on plan assets |  |  | 7.66% | 7.65% | 7.91% |  |  |
Voluntary contributions by employer to pension plan |  |  | $ 303 | $ 591 |  |  |  |
Pension | Scenario, Forecast |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Expected return on plan assets |  | 7.66% |  |  |  |  |  |
U.S. SRP |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Fair value of plan assets |  |  | 4,600 |  |  |  |  |
Projected benefit obligation |  |  | $ 5,200 |  |  |  |  |
Cash balance benefit percentage |  |  |  |  |  |  |  | 1.00%
Percentage of total projected benefit obligation (percent) |  |  | 90.00% |  |  |  |  |
Discount rate (percent) |  |  | 4.07% |  |  |  |  |
Expected return on plan assets |  |  | 7.75% |  |  |  |  |
U.S. SRP | Scenario, Forecast |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Expected return on plan assets |  | 7.75% |  |  |  |  |  |
U.S. SRP | Pension |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Voluntary contributions by employer to pension plan | $ 300 |  | $ 300 | $ 400 |  |  |  |

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