Condensed Consolidated Statements of Cash Flows Condensed Consolidated Statement of Cash Flows (Supplemental Disclosure) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 1,724	$ 217	$ 123
Restricted cash and restricted cash equivalents included in Other current assets	245	346	2,657
Restricted cash equivalents included in Other long-term assets	46	43	42
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period	$ 2,016	$ 607	$ 2,823	$ 829