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Senior Notes (Tables)	9 Months Ended
Senior Notes (Tables)	Sep. 30, 2022
Senior Notes [Abstract]
Schedule Of Outstanding Senior Notes	September 30, 2022 December 31, 2021 Consolidated Consolidated Principal Balance Sheet Fair Balance Sheet Fair (Dollars in millions) Date Issued Date Due Amounts Amount Value Amount Value 4.868 % Senior notes 06/05/2014 06/01/2044 400 $ 397 $ 339 $ 397 $ 504 3.5 % Senior notes 10/07/2020 10/15/2050 1,000 980 669 980 1,055 3.125 % Senior notes 10/04/2021 10/15/2052 1,000 969 627 968 983 2,400 $ 2,347 $ 1,635 $ 2,346 $ 2,542
Schedule Of Interest Expense Incurred In Connection With Senior Notes	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in millions) 2022 2021 2022 2021 Interest expense incurred 4.868 % Senior notes $ 5 $ 5 $ 15 $ 15 Interest expense incurred 3.5 % Senior notes 9 9 26 26 Interest expense incurred 3.125 % Senior notes 8 - 24 - $ 22 $ 14 $ 65 $ 41

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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