Business Combinations - Narrative (Details) - IH $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Kensington Vanguard National Land Services
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)	$ 199
Identifiable intangible assets increase	$ 138
Weighted average term	15 years
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 131
Business Acquisition, Identifiable Intangible Assets, Expected Tax Deductible Amount	110
BenefitMall
Business Acquisition [Line Items]
Goodwill, Period Increase (Decrease)	510
Identifiable intangible assets increase	$ 336
Weighted average term	15 years
Business Acquisition, Identifiable Intangible Assets, Expected Tax Deductible Amount	$ 80