Consolidated Statements of Cash Flows (Supplemental Disclosure) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 1,947	$ 1,734	$ 2,022
Restricted cash and restricted cash equivalents included in Other current assets	155	208	214
Restricted cash equivalents included in Other long-term assets	57	52	46
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 2,159	$ 1,995	$ 2,282	$ 607