Postemployment Benefits Postemployment Benefit Plans - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jul. 01, 2017	Dec. 30, 2017	Dec. 31, 2016	Jan. 03, 2016
Defined Benefit Plan Disclosure [Line Items]
Cost recognized		$ 78,000,000	$ 74,000,000	$ 52,000,000
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net asset (liability) recognized		758,000,000	160,000,000
Cash collateral		278,000,000
Securities lending payable		278,000,000
Net impact on total plan assets at fair value		0
Defined benefit plan, fair value of plan assets		8,941,000,000	8,416,000,000
Pension Plans | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		3,073,000,000	3,436,000,000
Pension Plans | Certain insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		983,000,000	189,000,000
Pension Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Additions		797,000,000
Defined benefit plan, fair value of plan assets		1,245,000,000	423,000,000	525,000,000
Pension Plans | Level 3 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		0	0
Pension Plans | Level 3 | Certain insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Additions		797,000,000
Defined benefit plan, fair value of plan assets		983,000,000	189,000,000	236,000,000
Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Net asset (liability) recognized		(365,000,000)	(1,714,000,000)
Employer contributions		(1,329,000,000)	0
Estimated future employer contributions in 2018		15,000,000
Defined benefit plan, contributions by employer excluding benefits paid as incurred		1,200,000,000
Defined benefit plan, fair value of plan assets		1,188,000,000	0	0
Curtailments	$ (177,000,000)	(177,000,000)	0	1,000,000
Benefits paid		142,000,000	0
Future amortization of prior service credits		$ 311,000,000
Postretirement Plans | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations		70.00%
Postretirement Plans | Return seeking assets
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations		30.00%
Postretirement Plans | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations		100.00%
Postretirement Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Year that rate reaches ultimate trend rate		2018
Postretirement Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Year that rate reaches ultimate trend rate		2030
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 4,700,000,000	5,200,000,000
Estimated future employer contributions in 2018		0
U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ (300,000,000)	$ (311,000,000)
Defined benefit plan, actual plan asset allocations		100.00%	100.00%
Defined benefit plan, fair value of plan assets		$ 4,785,000,000	$ 4,788,000,000	5,282,000,000
Curtailments		0	0	(96,000,000)
Benefits paid		$ 224,000,000	$ 268,000,000
U.S. Plans | Pension Plans | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations		70.00%
Defined benefit plan, actual plan asset allocations		62.00%	67.00%
U.S. Plans | Pension Plans | Return seeking assets
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations		30.00%
U.S. Plans | Pension Plans | Certain insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations		0.00%	0.00%
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 3,300,000,000	$ 3,000,000,000
Non-U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Change in projected benefit obligation due to wind up of our Canadian salaried and hourly defined benefit pension plans			85,000,000
Employer contributions		(30,000,000)	$ (33,000,000)
Estimated future employer contributions in 2018		$ 50,000,000
Defined benefit plan, actual plan asset allocations		100.00%	100.00%
Defined benefit plan, fair value of plan assets		$ 4,156,000,000	$ 3,628,000,000	3,428,000,000
Curtailments		0	0	$ (47,000,000)
Benefits paid		$ 161,000,000	$ 158,000,000
Non-U.S. Plans | Pension Plans | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations		65.00%
Defined benefit plan, actual plan asset allocations		39.00%	49.00%
Non-U.S. Plans | Pension Plans | Return seeking assets
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations		35.00%
Non-U.S. Plans | Pension Plans | Certain insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations		24.00%	5.00%