Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Retirement Plans
Percentage of eligible compensation contributed by employer to Retirement Account Plan	2.00%
Additional percentage of eligible compensation contributed annually by employer to defined contribution plan for employees hired after January 1, 2010	4.00%
Cost recognized for defined contribution plans	$ 88	$ 85	$ 88
Portion of contribution related to Retirement Account Plan	21	23	25
Other changes in plan assets and benefit obligations recognized in OCI
Current year actuarial loss (gain)	417	542	197
Amortization of prior service credit (cost)	(2)	(15)	(11)
Pension Benefits
Net periodic benefit cost
Service cost	119	129	124
Interest cost	305	327	328
Expected return on plan assets	(407)	(393)	(385)
Amortization of prior service cost (credit)	16	16	16
Amortization of net actuarial loss	118	75	41
Curtailment and special termination charges		(1)	2
Net periodic benefit cost	151	153	126
Other changes in plan assets and benefit obligations recognized in OCI
Current year actuarial loss (gain)	402	556	171
Current year prior service cost (credit)		7	5
Amortization of net actuarial loss	(118)	(75)	(41)
Amortization of prior service credit (cost)	(16)	(16)	(16)
Curtailments and settlements		1	(1)
Total recognized in OCI, before taxes	268	473	118
Total recognized in net periodic benefit cost and OCI	419	626	244
Postretirement Benefits Other than Pensions
Net periodic benefit cost
Service cost	6	8	8
Interest cost	25	33	34
Amortization of prior service cost (credit)	(11)	(8)	(4)
Amortization of net actuarial loss	7	11	11
Net periodic benefit cost	27	44	49
Other changes in plan assets and benefit obligations recognized in OCI
Current year actuarial loss (gain)	15	(17)
Current year prior service cost (credit)	(2)	(23)	(16)
Amortization of net actuarial loss	(7)	(11)	(11)
Amortization of prior service credit (cost)	11	8	4
Total recognized in OCI, before taxes	17	(43)	(23)
Total recognized in net periodic benefit cost and OCI	$ 44	$ 1	$ 26

Additional percentage of eligible compensation contributed annually by employer to defined contribution plan.

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Defined benefit plan recognized in net periodic benefit cost and other comprehensive income.

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Defined contribution plan cost recognized contribution in retirement account plan.

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Represents the curtailments and settlements.

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Percentage of eligible compensation contributed by employer to retirement account plan.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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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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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from 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, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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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 of the cost recognized during the period for defined contribution plans.

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Before tax amount of the benefit improvement costs resulting from a plan amendment that occurred that has not been recognized in net periodic benefit cost.

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Before tax amount of the income statement impact of the reclassification adjustment for prior service costs recognized as a component of net period benefit cost.

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Before tax amount, net of reclassifications, of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income.

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