Goodwill and Intangible Assets - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) brand	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) brand	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) brand	Apr. 01, 2020 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 50	$ 43	$ 93	$ 87
Estimated amortization expense of intangibles in 2020	190		190
Estimated amortization expense of intangibles in 2021	120		120
Estimated amortization expense of intangibles in 2022	110		110
Estimated amortization expense of intangibles in 2023	110		110
Estimated amortization expense of intangibles in 2024	110		110
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill	$ 20,997		20,997		$ 20,848
Impairment of intangible assets			$ 90
Brands
Goodwill and Intangible Assets Disclosure [Line Items]
Impairment of intangible assets					$ 57
Number of impaired brands | brand					9
Number of brands with fair value in excess of book value of 10% or less | brand	8		8
Book value of brands with fair value in excess of book value of 10% or less	$ 576		$ 576
Brands | Europe | Gum, Chocolate, Biscuits and Candy
Goodwill and Intangible Assets Disclosure [Line Items]
Impairment of intangible assets					$ 39
Brands | AMEA | Gum, Chocolate, Biscuits and Candy
Goodwill and Intangible Assets Disclosure [Line Items]
Impairment of intangible assets					15
Brands | Latin America | Gum, Chocolate, Biscuits and Candy
Goodwill and Intangible Assets Disclosure [Line Items]
Impairment of intangible assets					$ 3
Brands | COVID-19
Goodwill and Intangible Assets Disclosure [Line Items]
Impairment of intangible assets	$ 90
Number of impaired brands | brand	6		6
Brands | COVID-19 | Gum
Goodwill and Intangible Assets Disclosure [Line Items]
Number of impaired brands | brand	4		4
Brands | COVID-19 | Biscuits
Goodwill and Intangible Assets Disclosure [Line Items]
Number of impaired brands | brand	1		1
Brands | COVID-19 | Candy
Goodwill and Intangible Assets Disclosure [Line Items]
Number of impaired brands | brand	1		1
Brands | COVID-19 | Europe
Goodwill and Intangible Assets Disclosure [Line Items]
Impairment of intangible assets	$ 50
Brands | COVID-19 | North America
Goodwill and Intangible Assets Disclosure [Line Items]
Impairment of intangible assets	36
Brands | COVID-19 | AMEA
Goodwill and Intangible Assets Disclosure [Line Items]
Impairment of intangible assets	$ 4
Give & Go
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill						$ 530
Intangible assets acquired						$ 553