Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Description of business [Line Items]
Restricted Cash	$ 20		$ 15
Debt Issuance Costs, Noncurrent, Net	$ 36		35
Ownership Interest In Voting Rights Of Investee Required For Significant Influence Minimum	20.00%
Ownership Interest In Voting Rights Of Investee Required For Significant Influence Maximum	50.00%
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 76
Operating Lease, Liability, Noncurrent	16
Operating Lease, Liability, Current	$ 60		$ 0
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 90
Operating Lease, Liability, Noncurrent		46
Operating Lease, Liability, Current		$ 44
Restricted Stock Units
Description of business [Line Items]
Award vesting period	3 years