Consolidated Statements of Comprehensive Income - 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
Statement of Comprehensive Income [Abstract]
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
Other comprehensive income/(loss), net of tax:
Foreign currency translation adjustments	(378)	(144)	(862)	197	7	419	455	304	(665)	759	(809)	1,178	(1,187)	1,185	(979)
Net deferred gains/(losses) on net investment hedges	126	13	219	(74)	(26)	(124)	(152)	(51)	145	(203)	158	(327)	284	(353)	226
Amounts excluded from the effectiveness assessment of net investment hedges	4	3	0	0	0	0	0	0	0	0	3	0	7	0	0
Net deferred losses/(gains) on net investment hedges reclassified to net income/(loss)	(5)	(2)	0	0	0	0	0	0	0	0	(2)	0	(7)	0	0
Net deferred gains/(losses) on cash flow hedges	59	(16)	34	22	23	(70)	(32)	(34)	56	(66)	40	(136)	99	(113)	46
Amounts excluded from the effectiveness assessment of cash flow hedges	2	0	0	0	0	0	0	0	0	0	0	0	2	0	0
Net deferred losses/(gains) on cash flow hedges reclassified to net income/(loss)	(34)	12	(9)	(13)	(12)	51	26	20	(22)	46	(10)	97	(44)	85	(87)
Net actuarial gains/(losses) arising during the period	(12)	17	53	0	82	(4)	1	(10)	53	(9)	70	(13)	58	69	(40)
Prior service credits/(costs) arising during the period	3	0	0	0	16	0	1	0	0	1	0	1	3	17	31
Net postemployment benefit losses/(gains) reclassified to net income/(loss)	15	(58)	(17)	(58)	(49)	(51)	(154)	(55)	(75)	(209)	(133)	(260)	(118)	(309)	(204)
Total other comprehensive income/(loss)	(220)	(175)	(582)	74	41	221	145	174	(508)	319	(683)	540	(903)	581	(1,007)
Total comprehensive income/(loss)	(12,848)	443	171	1,077	8,023	1,133	1,302	1,055	1,248	2,357	1,691	3,490	(11,157)	11,513	2,599
Comprehensive income/(loss) attributable to noncontrolling interest	(61)	(3)	(7)	(5)	1	(1)	1	(4)	(12)	(3)	(15)	(4)	(76)	(3)	16
Comprehensive income/(loss) attributable to Kraft Heinz	$ (12,787)	$ 446	$ 178	$ 1,082	$ 8,022	$ 1,134	$ 1,301	$ 1,059	$ 1,260	$ 2,360	$ 1,706	$ 3,494	$ (11,081)	$ 11,516	$ 2,583