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Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Supplemental Information Relating to Operating Leases	Year Ended December 31, (Dollars in thousands) 2022 2021 Lease expense incurred: Operating lease cost $ 28 $ 27 At December 31, (Dollars in millions) 2022 2021 Operating lease right of use assets $ 128 $ 139 Operating lease liabilities 147 158 Year Ended December 31, (Dollars in millions) 2022 2021 Operating cash flows from operating leases $ (20) $ (18) At December 31, 2022 2021 Weighted average remaining operating lease term 10.8  years 11.6 years Weighted average discount rate on operating leases 4.08 % 4.08 %
Maturities of Lease Liabilities	(Dollars in thousands) 2023 $ 21 2024 21 2025 18 2026 16 2027 16 Thereafter 95 Undiscounted lease payments 187 Less: present value adjustment 40 Total operating lease liability $ 147

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- Definition

Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980

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- References

No definition available.

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- Definition

Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980

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