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Postretirement Benefit Plans - Components of Periodic Benefit Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 29, 2017 | Dec. 30, 2016 | Dec. 29, 2017 | Dec. 30, 2016
Net periodic benefit income |  |  |  |
Service cost | $ 10 | $ 14 | $ 20 | $ 29
Interest cost | 51 | 48 | 101 | 96
Expected return on plan assets | (96) | (89) | (192) | (178)
Amortization of net actuarial loss | (1) |  | (1) |
Total net periodic benefit income | (36) | (27) | (72) | (53)
Discontinued operations, net of income taxes |  |  |  |
Net periodic benefit income |  |  |  |
Total net periodic benefit income |  | 1 |  | 1
Pension |  |  |  |
Net periodic benefit income |  |  |  |
Service cost | 9 | 14 | 19 | 29
Interest cost | 49 | 46 | 97 | 92
Expected return on plan assets | (92) | (85) | (184) | (170)
Amortization of net actuarial loss | 0 |  | 0 |
Total net periodic benefit income | (34) | (25) | (68) | (49)
Other Benefits |  |  |  |
Net periodic benefit income |  |  |  |
Service cost | 1 | 0 | 1 | 0
Interest cost | 2 | 2 | 4 | 4
Expected return on plan assets | (4) | (4) | (8) | (8)
Amortization of net actuarial loss | (1) |  | (1) |
Total net periodic benefit income | $ (2) | $ (2) | $ (4) | $ (4)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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