Goodwill and Intangible Assets - Additional Information (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) brand	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) brand
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 43	$ 44
Estimated amortization expense of intangibles in 2020	170
Estimated amortization expense of intangibles in 2021	90
Estimated amortization expense of intangibles in 2022	80
Estimated amortization expense of intangibles in 2023	80
Estimated amortization expense of intangibles in 2024	$ 80
Brands
Goodwill and Intangible Assets Disclosure [Line Items]
Impairment of intangible assets			$ 57
Number of impaired brands | brand	9		9
Number of brands with fair value in excess of book value, 10% or less | brand	14
Book value of brands with fair value in excess of book value, 10% or less	$ 616
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