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Pension, Retiree Medical and Savings Plans (Selected Financial Information for Pension and Retiree Medical Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Pension Plans, Defined Benefit |  |  |
Change in fair value of plan assets |  |  |
Employer contributions/funding | $ 507 | $ 672 | $ 1,615
Retiree Medical Plan |  |  |
Change in projected benefit obligation |  |  |
Obligation at beginning of year | 988 | 996 |
Service cost | 25 | 23 | 32
Interest cost | 25 | 36 | 34
Plan amendments | (25) |  |
Experience loss | 81 | 36 |
Other, including foreign currency adjustment | 1 | 2 |
Obligation at end of year | 1,006 | 988 | 996
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (89) | (105) |
Change in fair value of plan assets |  |  |
Fair value at beginning of year | 302 | 285 |
Actual return on plan assets | 47 | 78 |
Employer contributions/funding | 55 | 44 | 93
Defined Benefit Plan, Plan Assets, Benefits Paid | (89) | (105) |
Fair value at end of year | 315 | 302 | 285
Funded status | (691) | (686) |
Amounts recognized |  |  |
Other current liabilities | (51) | (58) |
Other liabilities | (640) | (628) |
Net amount recognized | (691) | (686) |
Amounts included in accumulated other comprehensive loss (pre-tax) |  |  |
Net loss/(gain) | (212) | (285) |
Prior service (credit)/cost | (45) | (32) |
Total | (257) | (317) |
Changes recognized in net loss/(gain) included in other comprehensive loss |  |  |
Net loss/(gain) arising in current year | 50 | (24) |
Amortization and settlement recognition | 23 | 27 |
Foreign currency translation loss/(gain) |  | (1) |
Total | 73 | 2 |
Domestic Plan [Member] |  |  |
Change in projected benefit obligation |  |  |
Obligation at beginning of year | 15,230 | 13,807 |
Service cost | 434 | 381 | 431
Interest cost | 435 | 543 | 482
Plan amendments | (221) | 15 |
Experience loss | 2,042 | 2,091 |
Settlement/curtailment | (808) | (1,268) |
Special termination benefits | 19 | 2 |
Obligation at end of year | 16,753 | 15,230 | 13,807
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (378) | (341) |
Change in fair value of plan assets |  |  |
Fair value at beginning of year | 14,302 | 12,258 |
Actual return on plan assets | 1,908 | 3,101 |
Employer contributions/funding | 387 | 550 |
Defined Benefit Plan, Plan Assets, Benefits Paid | (378) | (341) |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (754) | (1,266) |
Fair value at end of year | 15,465 | 14,302 | 12,258
Funded status | (1,288) | (928) |
Amounts recognized |  |  |
Other assets | 797 | 744 |
Other current liabilities | (53) | (52) |
Other liabilities | (2,032) | (1,620) |
Net amount recognized | (1,288) | (928) |
Amounts included in accumulated other comprehensive loss (pre-tax) |  |  |
Net loss/(gain) | 4,116 | 3,516 |
Prior service (credit)/cost | (119) | 114 |
Total | 3,997 | 3,630 |
Changes recognized in net loss/(gain) included in other comprehensive loss |  |  |
Net loss/(gain) arising in current year | 1,009 | (120) |
Amortization and settlement recognition | (409) | (457) |
Total | 600 | (577) |
Accumulated benefit obligation at end of year | 15,949 | 14,255 |
Foreign Plan [Member] |  |  |
Change in projected benefit obligation |  |  |
Obligation at beginning of year | 3,753 | 3,098 |
Service cost | 86 | 73 | 92
Interest cost | 85 | 97 | 93
Plan amendments | (17) | 1 |
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant | 2 | 2 |
Experience loss | 467 | 515 |
Settlement/curtailment | (24) | (31) |
Other, including foreign currency adjustment | 170 | 98 |
Obligation at end of year | 4,430 | 3,753 | 3,098
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (92) | (100) |
Change in fair value of plan assets |  |  |
Fair value at beginning of year | 3,732 | 3,090 |
Actual return on plan assets | 401 | 551 |
Employer contributions/funding | 120 | 122 |
Participant contributions | 2 | 2 |
Defined Benefit Plan, Plan Assets, Benefits Paid | (92) | (100) |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (29) | (31) |
Other, including foreign currency adjustment | 169 | 98 |
Fair value at end of year | 4,303 | 3,732 | $ 3,090
Funded status | (127) | (21) |
Amounts recognized |  |  |
Other assets | 110 | 99 |
Other current liabilities | (1) | (1) |
Other liabilities | (236) | (119) |
Net amount recognized | (127) | (21) |
Amounts included in accumulated other comprehensive loss (pre-tax) |  |  |
Net loss/(gain) | 1,149 | 914 |
Prior service (credit)/cost | (19) |  |
Total | 1,130 | 914 |
Changes recognized in net loss/(gain) included in other comprehensive loss |  |  |
Net loss/(gain) arising in current year | 268 | 152 |
Amortization and settlement recognition | (75) | (44) |
Foreign currency translation loss/(gain) | 42 | 26 |
Total | 235 | 134 |
Accumulated benefit obligation at end of year | $ 4,108 | $ 3,441 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -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 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new 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)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. 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 (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 increases plan assets. + 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 (b)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=118255775&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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 (b)(8) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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