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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. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Pension Plans, Defined Benefit |  |  |
Change in fair value of plan assets |  |  |
Employer contributions/funding | $ 1,400 | $ 164 | $ 659
Retiree Medical Plan |  |  |
Change in projected benefit liability |  |  |
Liability at beginning of year | 1,187 | 1,208 |
Service cost | 32 | 28 | 31
Interest cost | 34 | 36 | 41
Plan amendments |  | (5) |
Experience (gain)/loss | (147) | 21 |
Special termination benefits | 1 | 2 |
Other, including foreign currency adjustment | (3) | 4 |
Liability at end of year | 996 | 1,187 | 1,208
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (108) | (107) |
Change in fair value of plan assets |  |  |
Fair value at beginning of year | 321 | 320 |
Defined Benefit Plan, Plan Assets, Benefits Paid | (108) | (107) |
Actual return on plan assets | (21) | 52 |
Employer contributions/funding | 93 | 56 | 36
Fair value at end of year | 285 | 321 | 320
Funded status | (711) | (866) |
Amounts recognized |  |  |
Other current liabilities | (41) | (75) |
Other liabilities | (670) | (791) |
Net amount recognized | (711) | (866) |
Amounts included in accumulated other comprehensive loss (pre-tax) |  |  |
Net loss/(gain) | (287) | (189) |
Prior service cost/(credit) | (51) | (71) |
Total | (338) | (260) |
Changes recognized in net loss/(gain) included in other comprehensive loss |  |  |
Net loss/(gain) arising in current year | (107) | (9) |
Amortization and settlement recognition | 8 | 12 |
Foreign currency translation (gain)/loss | 1 | 1 |
Total | (98) | 4 |
Domestic Plan [Member] |  |  |
Change in projected benefit liability |  |  |
Liability at beginning of year | 14,777 | 13,192 |
Service cost | 431 | 401 | 393
Interest cost | 482 | 468 | 484
Plan amendments | 83 | 10 |
Experience (gain)/loss | (972) | 1,529 |
Settlement/curtailment | (74) | (58) |
Special termination benefits | 36 | 60 |
Liability at end of year | 13,807 | 14,777 | 13,192
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (956) | (825) |
Change in fair value of plan assets |  |  |
Fair value at beginning of year | 12,582 | 11,458 |
Defined Benefit Plan, Plan Assets, Benefits Paid | (956) | (825) |
Actual return on plan assets | (789) | 1,935 |
Employer contributions/funding | 1,495 | 60 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (74) | (46) |
Fair value at end of year | 12,258 | 12,582 | 11,458
Funded status | (1,549) | (2,195) |
Amounts recognized |  |  |
Other assets | 185 | 286 |
Other current liabilities | (107) | (74) |
Other liabilities | (1,627) | (2,407) |
Net amount recognized | (1,549) | (2,195) |
Amounts included in accumulated other comprehensive loss (pre-tax) |  |  |
Net loss/(gain) | 4,093 | 3,520 |
Prior service cost/(credit) | 109 | 29 |
Total | 4,202 | 3,549 |
Changes recognized in net loss/(gain) included in other comprehensive loss |  |  |
Net loss/(gain) arising in current year | 760 | 431 |
Amortization and settlement recognition | (187) | (131) |
Total | 573 | 300 |
Accumulated benefit obligation at end of year | 12,890 | 13,732 |
Foreign Plan [Member] |  |  |
Change in projected benefit liability |  |  |
Liability at beginning of year | 3,490 | 3,124 |
Service cost | 92 | 91 | 80
Interest cost | 93 | 89 | 94
Plan amendments | 2 | 2 |
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant | 2 | 2 |
Experience (gain)/loss | (230) | 5 |
Settlement/curtailment | (35) | (22) |
Special termination benefits | 2 |  |
Other, including foreign currency adjustment | (204) | 303 |
Liability at end of year | 3,098 | 3,490 | 3,124
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (114) | (104) |
Change in fair value of plan assets |  |  |
Fair value at beginning of year | 3,460 | 2,894 |
Defined Benefit Plan, Plan Assets, Benefits Paid | (114) | (104) |
Participant contributions | 2 | 2 |
Actual return on plan assets | (136) | 288 |
Employer contributions/funding | 120 | 104 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (32) | (18) |
Other, including foreign currency adjustment | (210) | 294 |
Fair value at end of year | 3,090 | 3,460 | $ 2,894
Funded status | (8) | (30) |
Amounts recognized |  |  |
Other assets | 81 | 85 |
Other current liabilities | (1) | (1) |
Other liabilities | (88) | (114) |
Net amount recognized | (8) | (30) |
Amounts included in accumulated other comprehensive loss (pre-tax) |  |  |
Net loss/(gain) | 780 | 782 |
Prior service cost/(credit) | (1) | (3) |
Total | 779 | 779 |
Changes recognized in net loss/(gain) included in other comprehensive loss |  |  |
Net loss/(gain) arising in current year | 103 | (115) |
Amortization and settlement recognition | (56) | (60) |
Foreign currency translation (gain)/loss | (49) | 73 |
Total | (2) | (102) |
Accumulated benefit obligation at end of year | $ 2,806 | $ 2,985 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increases plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=108410482&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=108410482&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=108410482&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=112275985&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=108410482&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=108410482&loc=d3e1928-114920 + Details
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