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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. 28, 2019 | Dec. 29, 2018
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Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit, Unfunded plans | $ 847 |
Domestic Plan [Member] |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets |  |
Liability for service to date | (9,194) | $ (8,040)
Fair value of plan assets | 8,497 | 7,223
Selected information for plans with projected benefit liability in excess of plan assets |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | (10,169) | (8,957)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 8,497 | 7,223
Foreign Plan [Member] |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets |  |
Liability for service to date | (192) | (155)
Fair value of plan assets | 151 | 121
Selected information for plans with projected benefit liability in excess of plan assets |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | (632) | (514)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 512 | 426
Retiree Medical Plan |  |
Selected information for plans with projected benefit liability in excess of plan assets |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | (988) | (996)
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | $ 302 | $ 285

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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=118255775&loc=d3e2417-114920 + Details
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