Basis of Presentation and Significant Accounting Policies and Practices - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Advertising expense	$ 30	$ 34	$ 39
Antidilutive securities excluded from computation of earnings per share, Amount (in shares)	6	4	6
Maximum length to maturity of a security, from the investment date, where it is classified as cash and cash equivalent	90 days
Length to maturity from the investment date of a security where the length of time is too short to be classified as a short-term investment	90 days
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liability	$ 332
Lease assets	$ 337
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liability				$ 229
Lease assets				$ 229