Consolidated Statements of Cash Flows Consolidated Statement of Cash Flows (Supplemental Disclosure) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 1,734,000,000	$ 217,000,000	$ 146,000,000
Restricted cash and restricted cash equivalents included in Other current assets	208,000,000	346,000,000	655,000,000
Restricted cash equivalents included in Other long-term assets	52,000,000	43,000,000	27,000,000
Cash, cash equivalents, restricted cash and restricted cash equivalents	$ 1,995,000,000	$ 607,000,000	$ 829,000,000	$ 1,017,000,000