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Goodwill and Intangible Assets - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) Brand | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 02, 2016 USD ($)
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Amortization expense for intangible assets |  | $ 178,000,000 | $ 176,000,000 | $ 181,000,000 |
Estimated amortization expense in year 1 |  | 175,000,000 |  |  |
Estimated amortization expense in year 2 |  | 175,000,000 |  |  |
Estimated amortization expense in year 3 |  | 175,000,000 |  |  |
Estimated amortization expense in year 4 |  | 85,000,000 |  |  |
Estimated amortization expense in year 5 |  | 85,000,000 |  |  |
Goodwill, Divestitures |  | 114,000,000 | 4,000,000 |  |
Intangible Assets, Divestitures |  | 100,000,000 | 8,000,000 |  |
Business acquisition, goodwill adjustments |  | 15,000,000 |  |  |
Intangible Assets, Acquisition |  | 7,000,000 |  |  |
Business acquisition, goodwill |  | 21,085,000,000 | 20,276,000,000 | 20,664,000,000 |
Intangible asset impairment |  | 109,000,000 | 137,000,000 | 83,000,000 |
Impairment of goodwill |  | 0 | 0 | 0 |
Number of brands impaired trademarks | Brand | 5 |  |  |  |
Number of brands | Brand | 13 |  |  |  |
Indefinite-lived intangible assets at risk |  | 17,671,000,000 | 17,004,000,000 |  |
Burton's Biscuit Company |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Business acquisition, goodwill adjustments |  |  | 76,000,000 |  |
Business acquisition, goodwill |  |  | 385,000,000 |  | $ 173,000,000
North America Segment |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Business acquisition, goodwill |  | 8,933,000,000 | 8,885,000,000 |  |
Intangible asset impairment |  | 1,000,000 |  |  |
Europe Segment |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Business acquisition, goodwill |  | 7,880,000,000 | 7,170,000,000 |  |
Asia Middle East Africa Segment |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Business acquisition, goodwill |  | 3,371,000,000 | 3,324,000,000 |  |
FRANCE |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Goodwill, Divestitures |  | 23,000,000 |  |  |
Intangible Assets, Divestitures |  | 62,000,000 |  |  |
Vietnam |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Finite-lived intangible assets acquired |  |  | 25,000,000 |  |
Indefinite-lived intangible assets acquired |  |  | 61,000,000 |  |
Trademarks |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Intangible asset impairment | $ 70,000,000 | 70,000,000 | 98,000,000 | 71,000,000 |
Trademarks | North America Segment |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Intangible asset impairment |  | 38,000,000 | 19,000,000 |  |
Trademarks | Europe Segment |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Intangible asset impairment |  |  | 19,000,000 |  |
Trademarks | Asia Middle East Africa Segment |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Intangible asset impairment |  |  | 19,000,000 |  |
Trademarks | Venezuela |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Intangible asset impairment |  |  |  | $ 12,000,000 |
Fair Value Over Book Value 10% or Less | Trademarks |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Indefinite-lived intangible assets at risk | $ 963,000,000 |  |  |  |
Equity Method Investments |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Intangible assets |  | 14,000,000 |  |  |
Sale Of Confectionery Business In Costa Rica | Japan |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Goodwill, divested |  | 5,000,000 |  |  |
Intangible assets |  | 24,000,000 |  |  |
Sale Of Confectionery Business In France | Trademarks | Europe Segment |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Intangible asset impairment |  |  | 20,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Australia And New Zealand |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Goodwill, Divestitures |  | $ 86,000,000 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | FINLAND |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Intangible assets |  |  | 8,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sale Of Confectionery Business In Costa Rica | COSTA RICA |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Goodwill, divested |  |  | $ 4,000,000 |  |

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