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PENSION AND OTHER POSTRETIREMENT BENEFITS - Roll Forward of Projected Benefit Obligations (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 03, 2020 | Jan. 01, 2021 | Jun. 28, 2019 | Jun. 29, 2018
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of fiscal year |  | $ 10,637 | $ 6,344 |
Benefit obligation assumed in L3Harris Merger | $ 4,630 | 0 |  |
Service cost | 43 | 67 |  |
Interest cost | 154 | 283 |  |
Actuarial loss | 308 | 1,059 |  |
Amendments | (292) | 9 |  |
Benefits paid | (363) | (595) |  |
Settlements | (5) | 0 |  |
Special termination benefits | 0 | 1 |  |
Expenses paid | (43) | (42) |  |
Curtailments | (35) | 0 |  |
Foreign currency exchange rate changes | 3 | 11 |  |
Plan participants’ contributions | 1 | 2 |  |
Divestiture | (108) | 0 |  |
Benefit obligation at end of fiscal year | 10,637 | 11,432 |  | $ 6,344
Pension |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of fiscal year |  | 10,268 | 6,123 |
Benefit obligation assumed in L3Harris Merger | 4,474 | 0 |  |
Service cost | 42 | 65 | 36 | 39
Interest cost | 149 | 273 | 209 | 195
Actuarial loss | 301 | 1,035 |  |
Amendments | (292) | 1 |  |
Benefits paid | (342) | (569) |  |
Settlements | (5) | 0 |  |
Special termination benefits | 0 | 1 |  |
Expenses paid | (43) | (42) |  |
Curtailments | (35) | 0 |  |
Foreign currency exchange rate changes | 3 | 11 |  |
Plan participants’ contributions | 1 | 2 |  |
Divestiture | (108) | 0 |  |
Benefit obligation at end of fiscal year | 10,268 | 11,045 |  | 6,123
Other Benefits |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of fiscal year |  | 369 | 221 |
Benefit obligation assumed in L3Harris Merger | 156 | 0 |  |
Service cost | 1 | 2 | 0 | 1
Interest cost | 5 | 10 | $ 8 | 7
Actuarial loss | 7 | 24 |  |
Amendments | 0 | 8 |  |
Benefits paid | (21) | (26) |  |
Settlements | 0 | 0 |  |
Special termination benefits | 0 | 0 |  |
Expenses paid | 0 | 0 |  |
Curtailments | 0 | 0 |  |
Foreign currency exchange rate changes | 0 | 0 |  |
Plan participants’ contributions | 0 | 0 |  |
Divestiture | 0 | 0 |  |
Benefit obligation at end of fiscal year | $ 369 | $ 387 |  | $ 221

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase in benefit obligation of defined benefit plan from business combination. + 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 (a)(8) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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