Pensions and Other Benefit Plans - Schedule of Net Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Amounts Recognized in the Company’s Balance Sheet consist of the following:
Non-current assets	$ 526	$ 227
Current liabilities	(325)	(412)
Non-current liabilities	(10,074)	(9,615)
Retirement Plans
Change in Benefit Obligation
Projected benefit obligation - beginning of year	28,116	25,855
Service cost	1,080	949	$ 1,037
Interest cost	927	927	988
Plan participant contributions	60	54
Amendments	(7)	(48)
Actuarial (gains) losses	2,996	2,302
Divestitures & acquisitions	201	(24)
Curtailments, settlements & restructuring	(35)	(25)
Benefits paid from plan	1,050	1,210
Effect of exchange rates	933	(664)
Projected benefit obligation - end of year	33,221	28,116	25,855
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value — beginning of year	23,633	22,254
Actual return on plan assets	4,274	2,286
Company contributions	664	838
Plan participant contributions	60	54
Settlements	(32)	(25)
Divestitures & acquisitions	173	(24)
Benefits paid from plan assets	1,050	1,210
Effect of exchange rates	682	(540)
Plan assets at fair value - End of year	28,404	23,633	22,254
Funded status - end of year	(4,817)	(4,483)
Amounts Recognized in the Company’s Balance Sheet consist of the following:
Non-current assets	526	227
Current liabilities	(92)	(86)
Non-current liabilities	(5,251)	(4,624)
Total recognized in the consolidated balance sheet — end of year	(4,817)	(4,483)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss	8,140	7,749
Prior service cost (credit)	(25)	(12)
Unrecognized net transition obligation	0	0
Total before tax effects	8,115	7,737
Accumulated Benefit Obligation	29,793	25,319
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax [Abstract]
Net periodic benefit cost	594	422	971
Net actuarial (gain) loss	740	1,965
Amortization of net actuarial loss	(609)	(496)
Prior service cost (credit)	(7)	(48)
Amortization of prior service (cost) credit	(2)	(1)
Effect of exchange rates	256	(218)
Total loss/(income) recognized in other comprehensive income, before tax	378	1,202
Total recognized in net periodic benefit cost and other comprehensive income	972	1,624
Other Benefit Plans
Change in Benefit Obligation
Projected benefit obligation - beginning of year	4,605	4,669
Service cost	247	224	257
Interest cost	159	158	186
Plan participant contributions	0	0
Amendments	(17)	0
Actuarial (gains) losses	(166)	(73)
Divestitures & acquisitions	88	0
Curtailments, settlements & restructuring	2	0
Benefits paid from plan	351	378
Effect of exchange rates	15	5
Projected benefit obligation - end of year	4,582	4,605	4,669
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value — beginning of year	75	74
Actual return on plan assets	12	7
Company contributions	545	372
Plan participant contributions	0	0
Settlements	0	0
Divestitures & acquisitions	0	0
Benefits paid from plan assets	351	378
Effect of exchange rates	0	0
Plan assets at fair value - End of year	281	75	74
Funded status - end of year	(4,301)	(4,530)
Amounts Recognized in the Company’s Balance Sheet consist of the following:
Non-current assets	0	0
Current liabilities	(228)	(315)
Non-current liabilities	(4,073)	(4,215)
Total recognized in the consolidated balance sheet — end of year	(4,301)	(4,530)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial loss	1,500	1,804
Prior service cost (credit)	(137)	(150)
Unrecognized net transition obligation	0	0
Total before tax effects	1,363	1,654
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax [Abstract]
Net periodic benefit cost	508	477	$ 604
Net actuarial (gain) loss	(169)	(72)
Amortization of net actuarial loss	(138)	(135)
Prior service cost (credit)	(17)	0
Amortization of prior service (cost) credit	30	34
Effect of exchange rates	3	(1)
Total loss/(income) recognized in other comprehensive income, before tax	(291)	(174)
Total recognized in net periodic benefit cost and other comprehensive income	217	303
U.S. Plans
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax [Abstract]
Lump sum pension settlement	$ 127	$ 420