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Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2022
Summary Of Contributions To Defined Benefit Pension Plans	Years Ended December 31, (Dollars in millions) 2022 2021 2020 Company contributions $ 6 $ 4 $ 7
Summary Of Accumulated Benefit Obligation	At December 31, (Dollars in millions) 2022 2021 Qualified Plan $ 258 $ 339 Non-qualified Plan 6 12 Total $ 264 $ 352 (Some amounts may not reconcile due to rounding.)
Projected Benefit Obligations In Excess Of Plan Assets	At December 31, (Dollars in millions) 2022 2021 Qualified Plan Projected benefit obligation $ 284 $ 390 Fair value of plan assets 285 377 Non-qualified Plan Projected benefit obligation $ 6 $ 12 Fair value of plan assets - -
Accumulated Benefit Obligations In Excess Of Plan Assets	At December 31, (Dollars in millions) 2022 2021 Qualified Plan Accumulated benefit obligation $ - $ - Fair value of plan assets - - Non-qualified Plan Accumulated benefit obligation $ 6 $ 12 Fair value of plan assets - -
Defined Benefit Pension Plan [Member]
Summary Of Pension Expenses	Years Ended December 31, (Dollars in millions) 2022 2021 2020 Pension expense $ (2) $ 3 $ 8
Summary Of Status Of Plan	Years Ended December 31, (Dollars in millions) 2022 2021 Change in projected benefit obligation: Benefit obligation at beginning of year $ 403 $ 404 Service cost 9 11 Interest cost 10 8 Actuarial (gain)/loss (115) (9) Curtailment - - Benefits paid (15) (12) Projected benefit obligation at end of year 291 403 Change in plan assets: Fair value of plan assets at beginning of year 377 354 Actual return on plan assets (83) 31 Actual contributions during the year 6 4 Administrative expenses paid - - Benefits paid (15) (12) Fair value of plan assets at end of year 285 377 Funded status at end of year $ (6) $ (25) (Some amounts may not reconcile due to rounding.)
Amounts Recognized In The Consolidated Balance Sheets	At December 31, (Dollars in millions) 2022 2021 Other assets (due beyond one year) $ 1 $ - Other liabilities (due within one year) (1) (1) Other liabilities (due beyond one year) (6) (24) Net amount recognized in the consolidated balance sheets $ (6) $ (25) (Some amounts may not reconcile due to rounding.)
Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss)	At December 31, (Dollars in millions) 2022 2021 Accumulated income (loss) $ (56) $ (68) Accumulated other comprehensive income (loss) $ (56) $ (68) (Some amounts may not reconcile due to rounding.)
Other Changes In Other Comprehensive Income (Loss)	Years Ended December 31, (Dollars in millions) 2022 2021 Other comprehensive income (loss) at December 31, prior year $ (68) $ (92) Net gain (loss) arising during period 7 15 Recognition of amortizations in net periodic benefit cost: Actuarial loss 4 9 Curtailment loss recognized - - Other comprehensive income (loss) at December 31, current year $ (56) $ (68) (Some amounts may not reconcile due to rounding.)
Net Periodic Benefit Cost	Years Ended December 31, (Dollars in millions) 2022 2021 2020 Service cost $ 9 $ 11 $ 10 Interest cost 10 8 10 Expected return on assets (25) (24) (21) Amortization of actuarial loss from earlier periods 4 8 9 Settlement 1 - 1 Net periodic benefit cost $ (2) $ 3 $ 8 Other changes recognized in other comprehensive income (loss): Other comprehensive income (loss) attributable to change from prior year (12) (24) Total recognized in net periodic benefit cost and other comprehensive income (loss) $ (14) $ (21) (Some amounts may not reconcile due to rounding.)
Expected Benefit Payments	(Dollars in millions) 2023 $ 13 2024 14 2025 14 2026 15 2027 17 Next 5 years 100
Fair Value Measurement Levels For Qualified Plan Assets	Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in millions) December 31, 2022 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 4 $ 4 $ - $ - Mutual funds, fair value Fixed income (b) 68 68 - - Equities (c) 211 211 - - Total $ 283 $ 283 $ - $ - (Some amounts may not reconcile due to rounding.) This category includes high quality, short-term money market instruments, which are issued and payable in U.S. dollars. (b) This category includes fixed income funds, which invest in investment grade securities of corporations, governments and government agencies with approximately 70 % in U.S. securities and 30 % in international securities. (c) This category includes funds, which invest in small, mid and multi-cap equity securities including common stocks, securities convertible into common stock and securities with common stock characteristics, such as rights and warrants, with approximately 50 % in U.S. equities and 50 % in international equities. Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in millions) December 31, 2021 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 3 $ 3 $ - $ - Mutual funds, fair value Fixed income (b) 85 85 - - Equities (c) 287 287 - - Total $ 375 $ 375 $ - $ - (Some amounts may not reconcile due to rounding.) This category includes high quality, short-term money market instruments, which are issued and payable in U.S. dollars. (b) This category includes fixed income funds, which invest in investment grade securities of corporations, governments and government agencies with approximately 70 % in U.S. securities and 30 % in international securities. (c) This category includes funds, which invest in small, mid and multi-cap equity securities including common stocks, securities convertible into common stock and securities with common stock characteristics, such as rights and warrants, with approximately 50 % in U.S. equities and 50 % in international equities.
Post-Retirement Plan [Member]
Summary Of Status Of Plan	At December 31, (Dollars in millions) 2022 2021 Change in projected benefit obligation: Benefit obligation at beginning of year $ 31 $ 35 Service cost 1 1 Interest cost 1 1 Amendments - - Actuarial (gain)/loss (10) (6) Benefits paid - - Benefit obligation at end of year 21 31 Change in plan assets: Fair value of plan assets at beginning of year - - Employer contributions - - Benefits paid - - Fair value of plan assets at end of year - - Funded status at end of year $ (21) $ (31)
Amounts Recognized In The Consolidated Balance Sheets	At December 31, (Dollars in millions) 2022 2021 Other liabilities (due within one year) $ (1) $ (1) Other liabilities (due beyond one year) (21) (30) Net amount recognized in the consolidated balance sheets $ (21) $ (31) (Some amounts may not reconcile due to rounding.)
Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss)	At December 31, (Dollars in millions) 2022 2021 Accumulated income (loss) $ 13 $ 2 Accumulated prior service credit (cost) 1 2 Accumulated other comprehensive income (loss) $ 14 $ 4
Other Changes In Other Comprehensive Income (Loss)	Years Ended December 31, (Dollars in millions) 2022 2021 Other comprehensive income (loss) at December 31, prior year $ 4 $ (2) Net gain (loss) arising during period 10 6 Prior Service credit (cost) arising during period - - Recognition of amortizations in net periodic benefit cost: Actuarial loss (gain) - - Prior service cost - (1) Other comprehensive income (loss) at December 31, current year $ 14 $ 4
Net Periodic Benefit Cost	Years Ended December 31, (Dollars in millions) 2022 2021 2020 Service cost $ 1 $ 1 $ 1 Interest cost 1 1 1 Prior service credit recognition - (1) (1) Net gain recognition - - - Net periodic cost $ 1 $ 1 $ 1 Other changes recognized in other comprehensive income (loss): Other comprehensive gain (loss) attributable to change from prior year (10) (5) Total recognized in net periodic benefit cost and other comprehensive income (loss) $ (9) $ (4) (Some amounts may not reconcile due to rounding.)
Expected Benefit Payments	(Dollars in millions) 2023 $ 1 2024 1 2025 1 2026 1 2027 1 Next 5 years 7

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