Goodwill, Customer Relationships and Other Intangible Assets - Additional Information (Details) $ in Millions	3 Months Ended
Mar. 31, 2023 USD ($) segment reporting_unit	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Goodwill [Roll Forward]
Intangible assets, gross (including goodwill)	$ 26,300
Number of reportable segments \| segment	2
Number of operating segments \| segment	2
Goodwill	$ 12,657		$ 12,657
Accumulated impairment losses	$ 11,000		11,000
Number of reporting units \| reporting_unit	3
Amortization of intangible assets	$ 260	$ 274
Business
Goodwill [Roll Forward]
Goodwill	7,900		7,900
Mass Markets
Goodwill [Roll Forward]
Goodwill	$ 4,800		$ 4,800

Intangible Assets, Gross (Including Goodwill)

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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