Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions - Narrative (Details) € in Millions, $ in Millions					3 Months Ended		12 Months Ended
	Jan. 31, 2020 USD ($)	Sep. 19, 2019 USD ($)	Sep. 19, 2019 EUR (€)	Aug. 15, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill							$ 3,824	$ 3,508
Purchases of non-contolling interests in subsidiaries							$ 99	$ 0	$ 0
hello
Business Acquisition [Line Items]
Payments to acquire business	$ 351
Purchase price consideration	351
Other intangible assets	160
Goodwill	171
hello \| North America
Business Acquisition [Line Items]
Goodwill	171
hello \| Trademarks
Business Acquisition [Line Items]
Other intangible assets	$ 115
Useful life	25 years
hello \| Customer Relationships
Business Acquisition [Line Items]
Other intangible assets	$ 45
Useful life	17 years
Filorga
Business Acquisition [Line Items]
Payments to acquire business		$ 1,674	€ 1,516
Consideration transferred, other		38	€ 32
Purchase price consideration		1,712
Other intangible assets		1,051
Goodwill		923
Purchases of non-contolling interests in subsidiaries					$ 99	€ 85
Filorga \| Trademarks
Business Acquisition [Line Items]
Other intangible assets		774
Filorga \| Europe
Business Acquisition [Line Items]
Goodwill		923
Filorga \| Customer Relationships
Business Acquisition [Line Items]
Other intangible assets		$ 277
Useful life		14 years	14 years
Nigeria Joint Venture
Business Acquisition [Line Items]
Purchase price consideration				$ 31
Percentage of voting interests acquired				51.00%