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Fair Value Disclosure (Tables) | 12 Months Ended
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Dec. 31, 2022
Fair Value Disclosures [Abstract] |
Schedule of the three input levels in the hierarchy of fair value measurements | The three input levels in the hierarchy of fair value measurements are defined by the FASB generally as follows:
Input Level |  | Description of Input
Level 1 |  | Observable inputs such as quoted market prices in active markets.
Level 2 |  | Inputs other than quoted prices in active markets that are either directly or indirectly observable.
Level 3 |  | Unobservable inputs in which little or no market data exists.
Schedule of carrying amounts and estimated fair values of long-term debt, excluding capital lease obligations, and input levels to determine fair values | The following table presents the carrying amounts and estimated fair values of our financial liabilities as of December 31, 2022, as well as the input level used to determine the fair values indicated below:
|  |  | As of December 31, 2022 |  | As of December 31, 2021
| Input Level |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
|  |  | (Dollars in millions)
Liabilities-Long-term debt (excluding finance lease and other obligations) | 2 |  | $ | 2,154 |  |  | 1,691 |  |  | 2,154 |  |  | 2,298 |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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