Pension, Retiree Medical and Savings Plans (Selected Financial Information for Pension and Retiree Medical Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Pension Plans, Defined Benefit
Change in fair value of plan assets
Employer contributions/funding	$ 591	$ 200	$ 1,614
United States Pension Plan of US Entity, Defined Benefit
Change in projected benefit liability
Liability at beginning of year	11,825	12,886
Service cost	393	467	407
Interest cost	580	527	534
Plan amendments	(122)	22
Experience loss/(gain)	1,635	(1,522)
Benefit payments	(349)	(533)
Settlement/curtailment	(577)	(44)
Special termination benefits	24	22
Liability at end of year	13,409	11,825	12,886
Change in fair value of plan assets
Fair value at beginning of year	11,462	10,817
Actual return on plan assets	1,254	1,159
Employer contributions/funding	434	63
Benefit payments	(349)	(533)
Defined Benefit Plan, Settlements, Plan Assets	(577)	(44)
Fair value at end of year	12,224	11,462	10,817
Funded status	(1,185)	(363)
Amounts recognized
Other assets	97	603
Other current liabilities	(42)	(41)
Other liabilities	(1,240)	(925)
Net amount recognized	(1,185)	(363)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	2,918	2,069
Prior service (credit)/cost	(18)	125
Total	2,900	2,194
Components of the increase/(decrease) in net loss/(gain) included in accumulated other comprehensive loss
Change in discount rate	1,424	(1,532)
Employee-related assumption changes	345	24
Liability-related experience different from assumptions	(104)	(14)
Actual asset return different from expected return	(470)	(336)
Amortization and settlement of losses	(316)	(285)
Other, including foreign currency adjustments	(30)
Total	849	(2,143)
Liability at end of year for service to date	12,206	10,803
International
Change in projected benefit liability
Liability at beginning of year	2,859	2,788
Service cost	98	111	100
Interest cost	131	118	115
Plan amendments		(1)
Participant contributions	3	3
Experience loss/(gain)	512	(65)
Benefit payments	(86)	(91)
Settlement/curtailment	(25)	(3)
Foreign currency adjustment	(245)	(2)
Defined Benefit Plan, Other Changes		1
Liability at end of year	3,247	2,859	2,788
Change in fair value of plan assets
Fair value at beginning of year	2,777	2,463
Actual return on plan assets	401	265
Employer contributions/funding	157	137
Benefit payments	(86)	(91)
Defined Benefit Plan, Settlements, Plan Assets	(24)	(8)
Foreign currency adjustment	(226)	8
Fair value at end of year	3,002	2,777	2,463
Funded status	(245)	(82)
Amounts recognized
Other assets	37	74
Other current liabilities	(1)	(1)
Other liabilities	(281)	(155)
Net amount recognized	(245)	(82)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	1,003	849
Prior service (credit)/cost	(7)	(6)
Total	996	843
Components of the increase/(decrease) in net loss/(gain) included in accumulated other comprehensive loss
Change in discount rate	636	(166)
Employee-related assumption changes	(112)	91
Liability-related experience different from assumptions	(12)	10
Actual asset return different from expected return	(225)	(108)
Amortization and settlement of losses	(61)	(68)
Other, including foreign currency adjustments	(72)	(6)
Total	154	(247)
Liability at end of year for service to date	2,721	2,369
Retiree Medical Plan
Change in projected benefit liability
Liability at beginning of year	1,384	1,511
Service cost	36	45	50
Interest cost	58	54	65
Plan amendments	(125)
Experience loss/(gain)	190	(128)
Benefit payments	(101)	(97)
Special termination benefits	3	2
Foreign currency adjustment	(6)	(3)
Liability at end of year	1,439	1,384	1,511
Change in fair value of plan assets
Fair value at beginning of year	406	365
Actual return on plan assets	46	76
Employer contributions/funding	64	62	251
Benefit payments	(101)	(97)
Fair value at end of year	415	406	365
Funded status	(1,024)	(978)
Amounts recognized
Other current liabilities	(57)	(72)
Other liabilities	(967)	(906)
Net amount recognized	(1,024)	(978)
Amounts included in accumulated other comprehensive loss (pre-tax)
Net loss/(gain)	(49)	(222)
Prior service (credit)/cost	(166)	(69)
Total	(215)	(291)
Components of the increase/(decrease) in net loss/(gain) included in accumulated other comprehensive loss
Change in discount rate	98	(117)
Employee-related assumption changes	58	2
Liability-related experience different from assumptions	34	(13)
Actual asset return different from expected return	(19)	(49)
Amortization and settlement of losses	4	(1)
Other, including foreign currency adjustments	(2)
Total	$ 173	$ (178)

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Components of decrease increase in net loss change in discount rate

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Components of decrease increase in net loss liability related experience different from assumptions

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Components Of Decrease Increase In Net Loss Other Foreign Currency Adjustments And Other

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The amount of increase or decrease in benefit obligation due to settlements and curtailment.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The amount that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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