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Supplementary Information Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2021		Dec. 31, 2020	Jun. 30, 2020		Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 2,861		$ 3,526	$ 2,809
Cash, Cash Equivalents and Restricted Cash, Total Company	3,172	[1]	3,873	3,171	[1]	$ 2,173
Other Current Assets [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 311		$ 347	$ 362
[1] See page 17 for reconciliation of cash and cash equivalents and restricted cash presented in interim Consolidated Balance Sheets to total cash, cash equivalents and restricted cash presented in the interim Consolidated Statements of Cash Flows.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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