CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 811	$ 221	$ 215
Restricted cash included in Prepaid expenses and other current assets	11		10
Total cash, cash equivalents, and restricted cash at end of the period	$ 822	$ 232	$ 225	$ 114