Goodwill, Customer Relationships and Other Intangible Assets - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) reporting_unit segment	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Goodwill [Roll Forward]
Intangible assets, gross (including goodwill)	$ 15,400,000,000		$ 15,400,000,000
Number of reportable segments | segment			2
Goodwill	1,964,000,000		$ 1,964,000,000		$ 1,964,000,000
Accumulated impairment losses	21,700,000,000		$ 21,700,000,000		21,700,000,000
Number of reporting units | reporting_unit			3
Goodwill impairment	0	$ 8,793,000,000	$ 0	$ 8,793,000,000
Amortization of intangible assets	277,000,000	$ 263,000,000	549,000,000	$ 523,000,000
Minimum | Revenue Multiple
Goodwill [Roll Forward]
Goodwill impairment, measurement input		1.5		1.5
Minimum | EBITDA Multiple
Goodwill [Roll Forward]
Goodwill impairment, measurement input		4.6		4.6
Maximum | Revenue Multiple
Goodwill [Roll Forward]
Goodwill impairment, measurement input		4.3		4.3
Maximum | EBITDA Multiple
Goodwill [Roll Forward]
Goodwill impairment, measurement input		10.5		10.5
Business
Goodwill [Roll Forward]
Goodwill	0		0		0
Mass Markets
Goodwill [Roll Forward]
Goodwill	$ 2,000,000,000		$ 2,000,000,000		$ 2,000,000,000