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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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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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 - Schedule of Acquisitions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 4,071	$ 3,900	$ 3,858	$ 3,921
2020 Acquisitions
Business Acquisition [Line Items]
Accounts/finance receivables	20
Goodwill	111
Other assets	44
Total Assets acquired	262
Liabilities assumed	(59)
Total Purchase Price	$ 203
Customer relationships \| 2020 Acquisitions
Business Acquisition [Line Items]
Intangible assets, weighted average life (years)	9 years
Intangible assets	$ 69
Trademarks \| 2020 Acquisitions
Business Acquisition [Line Items]
Intangible assets, weighted average life (years)	9 years
Intangible assets	$ 9
Technology \| 2020 Acquisitions
Business Acquisition [Line Items]
Intangible assets, weighted average life (years)	3 years
Intangible assets	$ 9