Goodwill, Customer Relationships and Other Intangible Assets - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2021 USD ($) reporting_unit	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 31, 2021	Jul. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Number of reporting units | reporting_unit		1
Goodwill impairment (as a percent)					14.00%	17.00%	17.00%	26.00%
Goodwill impairment	$ 3,700	$ 0	$ 0	$ 3,708
Acquired finite-lived intangible asset amortization expense		843	$ 838	$ 809
Intangible assets and goodwill		$ 15,600
Acquired finite-lived intangible assets, weighted average useful life		8 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		9 years
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		1 year
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		4 years
Revenue Multiple | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill impairment, measurement input	2.1
Revenue Multiple | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill impairment, measurement input	4.9
EBITDA Multiple | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill impairment, measurement input	4.9
EBITDA Multiple | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill impairment, measurement input	9.8