Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
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	$ 99	$ 93	$ 88
Portion of contribution related to Retirement Account Plan	16	19	21
Other changes in plan assets and benefit obligations recognized in OCI
Current year actuarial loss (gain)	734	(1,019)	417
Amortization of net actuarial loss	(114)	(189)	(124)
Amortization of prior service credit (cost)	8	2	(5)
Pension Benefits
Net periodic benefit cost
Service cost	109	133	119
Interest cost	334	290	305
Expected return on plan assets	(462)	(418)	(407)
Amortization of prior service cost (credit)	15	15	16
Amortization of net actuarial loss	112	183	118
Net periodic benefit cost	108	203	151
Other changes in plan assets and benefit obligations recognized in OCI
Current year actuarial loss (gain)	729	(964)	402
Current year prior service cost (credit)	12	16
Amortization of net actuarial loss	(112)	(183)	(118)
Amortization of prior service credit (cost)	(15)	(15)	(16)
Total recognized in OCI, before taxes	614	(1,146)	268
Total recognized in net periodic benefit cost and OCI	722	(943)	419
Postretirement Benefits Other than Pensions
Net periodic benefit cost
Service cost	4	6	6
Interest cost	19	19	25
Amortization of prior service cost (credit)	(23)	(17)	(11)
Amortization of net actuarial loss	2	6	7
Net periodic benefit cost	2	14	27
Other changes in plan assets and benefit obligations recognized in OCI
Current year actuarial loss (gain)	5	(55)	15
Current year prior service cost (credit)	(30)	(45)	(2)
Amortization of net actuarial loss	(2)	(6)	(7)
Amortization of prior service credit (cost)	23	17	11
Total recognized in OCI, before taxes	(4)	(89)	17
Total recognized in net periodic benefit cost and OCI	$ (2)	$ (75)	$ 44

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

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- Definition

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

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- Definition

Defined contribution plan cost recognized contribution in retirement account plan.

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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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- Definition

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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- Definition

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.

+ References

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-Name Accounting Standards Codification

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- Definition

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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- Definition

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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-Glossary Service Cost (Component of Net Periodic Pension Cost)

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

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Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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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.

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