Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) subsidiary	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of owned subsidiaries | subsidiary	2
Years forecasted in goodwill impairment income approach	5 years
Advertising expense | $	$ 191	$ 193	$ 183
Valuation, Income Approach
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fair value approach, weighted average, percentage	75.00%
Valuation, Market Approach
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fair value approach, weighted average, percentage	25.00%