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Pension, Retiree Medical and Savings Plans (Selected Information About Plans with Liability for Service to Date and Total Benefit Liability in Excess of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 25, 2021 | Dec. 26, 2020
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Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit, Unfunded plans | $ 810 |
Domestic Plan [Member] |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets (a) |  |
Obligation for service to date | (1,499) | $ (5,537)
Fair value of plan assets | 705 | 4,156
Selected information for plans with projected benefit obligation in excess of plan assets (a) |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | (1,709) | (9,172)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 705 | 7,088
Foreign Plan [Member] |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets (a) |  |
Obligation for service to date | (127) | (172)
Fair value of plan assets | 102 | 123
Selected information for plans with projected benefit obligation in excess of plan assets (a) |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | (286) | (2,933)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 171 | 2,696
Retiree Medical Plan |  |
Selected information for plans with projected benefit obligation in excess of plan assets (a) |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | (954) | (1,006)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | $ 299 | $ 315

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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of 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 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 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=123450688&loc=d3e4179-114921 + Details
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