Postemployment Benefits Pension Plans - Changes in Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Details) - Pension Plans - USD ($) $ in Millions	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 6,908
Fair value of plan assets at end of year	7,676	$ 6,908
U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	4,060	4,719
Service cost	7	10	$ 11
Interest cost	163	158	178
Benefits paid	(331)	(191)
Actuarial losses/(gains)	602	(447)
Plan amendments	0	1
Currency	0	0
Settlements	0	(190)
Curtailments	0	0	0
Special/contractual termination benefits	0	0
Other	0	0
Benefit obligation at end of year	4,501	4,060	4,719
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	4,219	4,785
Actual return on plan assets	947	(185)
Employer contributions	0	0
Benefits paid	(331)	(191)
Currency	0	0
Settlements	0	(190)
Other	0	0
Fair value of plan assets at end of year	4,835	4,219	4,785
Net pension liability/(asset) recognized at end of year	334	159
Non-U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	1,930	3,464
Service cost	17	19	19
Interest cost	51	67	66
Benefits paid	(122)	(126)
Actuarial losses/(gains)	252	(118)
Plan amendments	0	14
Currency	59	(175)
Settlements	0	(1,221)
Curtailments	0	(1)	0
Special/contractual termination benefits	4	7
Other	(4)	0
Benefit obligation at end of year	2,187	1,930	3,464
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	2,689	4,156
Actual return on plan assets	177	49
Employer contributions	19	57
Benefits paid	(122)	(126)
Currency	78	(221)
Settlements	0	(1,221)
Other	0	(5)
Fair value of plan assets at end of year	2,841	2,689	$ 4,156
Net pension liability/(asset) recognized at end of year	$ 654	$ 759

Change in Fair Value of Plan Assets, Other

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. 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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change, classified as other.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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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.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

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