Condensed Consolidated Statements of Cash Flows (unaudited) (Parenthetical) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Statement of Cash Flows [Abstract]
Cash and cash equivalents		$ 3,258	$ 3,730	$ 4,359
Restricted cash included in prepaid expenses and other current assets		3	6	7
Cash, cash equivalents and restricted cash	[1]	$ 3,261	$ 3,736	$ 4,366

[1] We did not have any restricted cash balances as of December 31, 2019. The following table provides a reconciliation of cash, cash equivalents and restricted cash shown above to the amounts reported within the condensed consolidated balance sheet as of September 30, 2021, December 31, 2020, and September 30, 2020 (in millions): September 30, 2021December 31, 2020September 30, 2020Cash and cash equivalents$3,258 $3,730 $4,359 Restricted cash included in prepaid expenses and other current assets3 6 7 Cash, cash equivalents and restricted cash$3,261 $3,736 $4,366