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Cash and Cash Equivalents (Summary of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Abstract]
Cash	$ 0	$ 49
Marketable securities	25	1
Total	$ 25	$ 50

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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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