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Senior Notes (Tables)	12 Months Ended
Senior Notes (Tables)	Dec. 31, 2022
Senior Notes [Abstract]
Schedule Of Outstanding Senior Notes	December 31, 2022 December 31, 2021 Consolidated Consolidated Principal Balance Sheet Balance Sheet (Dollars in millions) Date Issued Date Due Amounts Amount Market Value Amount Market Value 4.868 % Senior notes 6/5/2014 6/1/2044 $ 400 $ 397 $ 343 $ 397 $ 504 3.5 % Senior notes 10/7/2020 10/15/2050 1,000 981 677 980 1,055 3.125 % Senior notes 10/4/2021 10/15/2052 1,000 969 627 969 983 $ 2,400 $ 2,347 $ 1,647 $ 2,346 $ 2,542
Schedule Of Interest Expense Incurred In Connection With Senior Notes	Years Ended December 31, (Dollars in millions) Interest Paid Payable Dates 2022 2021 2020 4.868 % Senior Notes semi-annually June 1/December 1 $ 19 $ 19 $ 19 3.5 % Senior Notes semi-annually April 15/October 15 35 35 8 3.125 % Senior Notes semi-annually April 15/October 15 32 8 - $ 86 $ 62 $ 28 (Some amounts may not reconcile due to rounding.)

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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