Description Of Business And Significant Accounting Policies (Schedule Of Cash, Cash Equivalents And Restricted Cash) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Description Of Business And Significant Accounting Policies [Abstract]
Cash and cash equivalents	$ 11	$ 27
Restricted cash, current	13
Restricted cash, noncurrent	30
Total cash, cash equivalents and restricted cash on the Statements of Consolidated Cash Flows	$ 54	$ 27	$ 4	$ 3

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

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Name:	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant