Quarterly Financial Data (Unaudited) Schedule of Condensed Consolidated Quarterly Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income/(loss)	$ (12,628)	$ 618	$ 753	$ 1,003	$ 7,982	$ 912	$ 1,157	$ 881	$ 1,756	$ 2,038	$ 2,374	$ 2,950	$ (10,254)	$ 10,932	$ 3,606
Depreciation and amortization				227				262	462	517	712	789	983	1,031	1,337
Amortization of postretirement benefit plans prior service costs/(credits)				(106)				(82)	(183)	(171)	(261)	(247)	(339)	(328)	(347)
Equity award compensation expense				7				11	27	24	44	36	33	46	46
Deferred income tax provision/(benefit)				(46)				68	79	223	104	432	(1,967)	(6,495)	(72)
Postemployment benefit plan contributions				(22)				(38)	(60)	(90)	(64)	(283)	(76)	(1,659)	(494)
Goodwill and intangible asset impairment losses				0				0	234	48	451	49	15,936	49	18
Nonmonetary currency devaluation				47				8	67	33	131	36	146	36	24
Other items, net				(22)				40	27	(48)	35	(62)	175	253	25
Trade receivables				(712)				(1,040)	(2,001)	(1,598)	(2,154)	(2,061)	(2,280)	(2,629)	(2,055)
Inventories				(312)				(475)	(428)	(418)	(645)	(567)	(251)	(236)	(130)
Accounts payable				(85)				62	127	84	130	123	(23)	441	879
Other current assets				26				(72)	(44)	(103)	(103)	(90)	(146)	(64)	(41)
Other current liabilities				403				(240)	153	(717)	124	(1,090)	637	(876)	(148)
Net cash provided by/(used for) operating activities				408				(615)	216	(178)	878	15	2,574	501	2,648
Cash receipts on sold receivables				436				464	1,221	1,069	1,296	1,633	1,296	2,286	2,589
Capital expenditures				(223)				(368)	(438)	(690)	(594)	(956)	(826)	(1,194)	(1,247)
Payments to acquire business, net of cash acquired				(215)				0	(215)	0	(248)	0	(248)	0	0
Other investing activities, net				6				38	11	44	31	45	66	85	110
Net cash provided by/(used for) investing activities				4				134	579	423	485	722	288	1,177	1,452
Repayments of long-term debt				(6)				(27)	(12)	(2,032)	(2,706)	(2,635)	(2,713)	(2,641)	(85)
Proceeds from issuance of long-term debt				0				2	2,990	4	2,990	1,496	2,990	1,496	6,981
Proceeds from issuance of commercial paper				1,524				2,324	1,525	4,213	2,485	5,495	2,784	6,043	6,680
Repayments of commercial paper				(1,006)				(2,068)	(1,950)	(3,777)	(1,950)	(5,709)	(3,213)	(6,249)	(6,043)
Dividends paid - Series A Preferred Stock				0				0	0	0	0	0	0	0	(180)
Dividends paid - common stock				(897)				(736)	(1,659)	(1,434)	(2,421)	(2,161)	(3,183)	(2,888)	(3,584)
Redemption of Series A Preferred Stock				0				0	0	0	0	0	0	0	(8,320)
Other financing activities, net				14				0	(3)	15	(35)	28	(28)	18	(69)
Net cash provided by/(used for) financing activities				(371)				(505)	891	(3,011)	(1,637)	(3,486)	(3,363)	(4,221)	(4,620)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				(10)				13	(80)	29	(128)	43	(132)	57	(137)
Net increase/(decrease)				31				(973)	1,606	(2,737)	(402)	(2,706)	(633)	(2,486)	(657)
Balance at beginning of period	1,367	3,375	1,800	1,769	1,549	1,518	3,282	4,255	1,769	4,255	1,769	4,255	1,769	4,255	4,912
Balance at end of period	1,136	1,367	3,375	1,800	1,769	1,549	1,518	3,282	3,375	1,518	1,367	1,549	1,136	1,769	4,255
Beneficial interest obtained in exchange for securitized trade receivables				613				880	899	1,407	938	1,936	938	2,519	2,213
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income/(loss)		628	755	993	7,996	943	1,160	891	1,748	2,051	2,376	2,994		10,990	3,642
Depreciation and amortization				234				262	476	517	736	790		1,036	1,337
Amortization of postretirement benefit plans prior service costs/(credits)				(106)				(82)	(183)	(171)	(261)	(247)		(328)	(333)
Equity award compensation expense				7				11	27	24	44	36		46	46
Deferred income tax provision/(benefit)				(47)				105	58	269	96	492		(6,467)	(29)
Postemployment benefit plan contributions				(22)				(38)	(60)	(90)	(64)	(283)		(1,659)	(494)
Goodwill and intangible asset impairment losses				0				0	265	48	499	49		49	0
Nonmonetary currency devaluation				47				8	67	33	131	36		36	24
Other items, net				5				35	59	(31)	36	(52)		219	16
Trade receivables				(712)				(1,040)	(2,001)	(1,598)	(2,154)	(2,061)		(2,629)	(2,055)
Inventories				(312)				(492)	(440)	(431)	(663)	(580)		(251)	(130)
Accounts payable				(69)				62	143	84	145	123		464	943
Other current assets				9				(67)	(66)	(121)	(105)	(137)		(67)	(42)
Other current liabilities				386				(270)	136	(762)	83	(1,144)		(912)	(276)
Net cash provided by/(used for) operating activities				413				(615)	229	(178)	899	16		527	2,649
Cash receipts on sold receivables				436				464	1,221	1,069	1,296	1,633		2,286	2,589
Capital expenditures				(223)				(368)	(438)	(690)	(594)	(956)		(1,217)	(1,247)
Payments to acquire business, net of cash acquired				(215)				0	(215)	0	(248)	0		0	0
Other investing activities, net				6				38	11	44	31	47		87	110
Net cash provided by/(used for) investing activities				4				134	579	423	485	724		1,156	1,452
Repayments of long-term debt				(11)				(27)	(25)	(2,032)	(2,727)	(2,636)		(2,644)	(86)
Proceeds from issuance of long-term debt				0				2	2,990	4	2,990	1,496		1,496	6,981
Proceeds from issuance of commercial paper				1,524				2,324	1,525	4,213	2,485	5,495		6,043	6,680
Repayments of commercial paper				(1,006)				(2,068)	(1,950)	(3,777)	(1,950)	(5,709)		(6,249)	(6,043)
Dividends paid - Series A Preferred Stock				0				0	0	0	0	0		0	(180)
Dividends paid - common stock				(897)				(736)	(1,659)	(1,434)	(2,421)	(2,161)		(2,888)	(3,584)
Redemption of Series A Preferred Stock				0				0	0	0	0	0		0	(8,320)
Other financing activities, net				14				0	(3)	15	(35)	26		16	(69)
Net cash provided by/(used for) financing activities				(376)				(505)	878	(3,011)	(1,658)	(3,489)		(4,226)	(4,621)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				(10)				13	(80)	29	(128)	43		57	(137)
Net increase/(decrease)				31				(973)	1,606	(2,737)	(402)	(2,706)		(2,486)	(657)
Balance at beginning of period	1,367	3,375	1,800	1,769	1,549	1,518	3,282	4,255	1,769	4,255	1,769	4,255	1,769	4,255	4,912
Balance at end of period		1,367	3,375	1,800	1,769	1,549	1,518	3,282	3,375	1,518	1,367	1,549		1,769	4,255
Beneficial interest obtained in exchange for securitized trade receivables				613				880	899	1,407	938	1,936		2,519	2,213
Restatement | Restatement Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income/(loss)		(10)	(2)	10	(14)	(31)	(3)	(10)	8	(13)	(2)	(44)		(58)	(36)
Depreciation and amortization				(7)				0	(14)	0	(24)	(1)		(5)	0
Amortization of postretirement benefit plans prior service costs/(credits)				0				0	0	0	0	0		0	(14)
Equity award compensation expense				0				0	0	0	0	0		0	0
Deferred income tax provision/(benefit)				1				(37)	21	(46)	8	(60)		(28)	(43)
Postemployment benefit plan contributions				0				0	0	0	0	0		0	0
Goodwill and intangible asset impairment losses				0				0	(31)	0	(48)	0		0	18
Nonmonetary currency devaluation				0				0	0	0	0	0		0	0
Other items, net				(27)				5	(32)	(17)	(1)	(10)		34	9
Trade receivables				0				0	0	0	0	0		0	0
Inventories				0				17	12	13	18	13		15	0
Accounts payable				(16)				0	(16)	0	(15)	0		(23)	(64)
Other current assets				17				(5)	22	18	2	47		3	1
Other current liabilities				17				30	17	45	41	54		36	128
Net cash provided by/(used for) operating activities				(5)				0	(13)	0	(21)	(1)		(26)	(1)
Cash receipts on sold receivables				0				0	0	0	0	0		0	0
Capital expenditures				0				0	0	0	0	0		23	0
Payments to acquire business, net of cash acquired				0				0	0	0	0	0		0	0
Other investing activities, net				0				0	0	0	0	(2)		(2)	0
Net cash provided by/(used for) investing activities				0				0	0	0	0	(2)		21	0
Repayments of long-term debt				5				0	13	0	21	1		3	1
Proceeds from issuance of long-term debt				0				0	0	0	0	0		0	0
Proceeds from issuance of commercial paper				0				0	0	0	0	0		0	0
Repayments of commercial paper				0				0	0	0	0	0		0	0
Dividends paid - Series A Preferred Stock				0				0	0	0	0	0		0	0
Dividends paid - common stock				0				0	0	0	0	0		0	0
Redemption of Series A Preferred Stock				0				0	0	0	0	0		0	0
Other financing activities, net				0				0	0	0	0	2		2	0
Net cash provided by/(used for) financing activities				5				0	13	0	21	3		5	1
Effect of exchange rate changes on cash, cash equivalents, and restricted cash				0				0	0	0	0	0		0	0
Net increase/(decrease)				0				0	0	0	0	0		0	0
Balance at beginning of period	$ 0	0	0	0	0	0	0	0	0	0	0	0	$ 0	0	0
Balance at end of period		$ 0	$ 0	0	$ 0	$ 0	$ 0	0	0	0	0	0		0	0
Beneficial interest obtained in exchange for securitized trade receivables				0				$ 0	0	$ 0	0	0		0	0
Restatement, Capital Leases | Restatement Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by/(used for) operating activities				(5)					(13)		(21)			(2)
Net cash provided by/(used for) financing activities				(5)					13		(21)			2
Restatement, Other Misclassifications | Restatement Impacts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by/(used for) operating activities				(1)					(1)		(1)	(1)		(1)	(1)
Net cash provided by/(used for) investing activities												(2)		(2)
Net cash provided by/(used for) financing activities				$ (1)					$ 1		$ (1)	$ (3)		$ 3	$ 1