Consolidated Statements of Income - USD ($) $ in Millions		3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 29, 2018	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
Income Statement [Abstract]
Net sales		$ 6,891	$ 6,383	$ 6,690	$ 6,304	$ 6,841	$ 6,279	$ 6,634	$ 6,322	$ 12,994	$ 12,956	$ 19,377	$ 19,235	$ 26,268	$ 26,076	$ 26,300
Cost of products sold		4,675	4,289	4,343	4,040	4,554	4,123	4,227	4,139	8,383	8,366	12,672	12,489	17,347	17,043	17,154
Gross profit		2,216	2,094	2,347	2,264	2,287	2,156	2,407	2,183	4,611	4,590	6,705	6,746	8,921	9,033	9,146
Selling, general and administrative expenses, excluding impairment losses		867	803	771	764	778	664	720	765	1,535	1,485	2,338	2,149	3,205	2,927	3,527
Goodwill impairment losses	$ 6,900	6,875	0	133	0	0	0	0	0	133	0	133	0	7,008	0	0
Intangible asset impairment losses		8,610	217	101	0	0	1	48	0	101	48	318	49	8,928	49	18
Selling, general and administrative expenses		16,352	1,020	1,005	764	778	665	768	765	1,769	1,533	2,789	2,198	19,141	2,976	3,545
Operating income/(loss)		(14,136)	1,074	1,342	1,500	1,509	1,491	1,639	1,418	2,842	3,057	3,916	4,548	(10,220)	6,057	5,601
Interest expense		325	326	316	317	308	306	307	313	633	620	959	926	1,284	1,234	1,134
Other expense/(income), net		13	(71)	(35)	(90)	(116)	(127)	(254)	(130)	(125)	(384)	(196)	(511)	(183)	(627)	(472)
Income/(loss) before income taxes		(14,474)	819	1,061	1,273	1,317	1,312	1,586	1,235	2,334	2,821	3,153	4,133	(11,321)	5,450	4,939
Provision for/(benefit from) income taxes		(1,846)	201	308	270	(6,665)	400	429	354	578	783	779	1,183	(1,067)	(5,482)	1,333
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
Net income/(loss) attributable to noncontrolling interest		(60)	(1)	(1)	0	(7)	(1)	1	(2)	(1)	(1)	(2)	(2)	(62)	(9)	10
Net income/(loss) attributable to Kraft Heinz		(12,568)	619	754	1,003	7,989	913	1,156	883	1,757	2,039	2,376	2,952	(10,192)	10,941	3,596
Preferred dividends		0	0	0	0	0	0	0	0	0	0	0	0	0	0	180
Net income/(loss) attributable to common shareholders		$ (12,568)	$ 619	$ 754	$ 1,003	$ 7,989	$ 913	$ 1,156	$ 883	$ 1,757	$ 2,039	$ 2,376	$ 2,952	$ (10,192)	$ 10,941	$ 3,416
Per share data applicable to common shareholders:
Basic earnings/(loss) per share (in dollars per share)		$ (10.30)	$ 0.51	$ 0.62	$ 0.82	$ 6.55	$ 0.75	$ 0.95	$ 0.73	$ 1.44	$ 1.67	$ 1.95	$ 2.42	$ (8.36)	$ 8.98	$ 2.81
Diluted earnings/(loss) per share (in dollars per share)		$ (10.30)	$ 0.50	$ 0.62	$ 0.82	$ 6.50	$ 0.74	$ 0.94	$ 0.72	$ 1.43	$ 1.66	$ 1.94	$ 2.40	$ (8.36)	$ 8.91	$ 2.78