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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill and Other Intangible Asset Balances | The following table presents goodwill and other intangible asset balances and adjustments to those balances for the years ended December 31, 2023 and 2022:
| Goodwill |  | Intangible Assets |  |
(Dollars in Millions) | Net Carrying Amount |  | Cost | Accumulated Amortization | Net Carrying Amount |  | Total Goodwill and Other Intangible Assets - Net
Balance at December 31, 2021 | $ | 276 |  |  | $ | 180 |  | $ | (5) |  | $ | 175 |  |  | $ | 451 |
Additions | 43 |  |  | 18 |  | — |  | 18 |  |  | 61 |
Amortization | — |  |  | — |  | (10) |  | (10) |  |  | (10) |
Balance at December, 31, 2022 | $ | 319 |  |  | $ | 198 |  | $ | (15) |  | $ | 183 |  |  | $ | 502 |
Additions | 6 |  |  | 8 |  | — |  | 8 |  |  | 14 |
Amortization | — |  |  | — |  | (10) |  | (10) |  |  | (10) |
Balance at December, 31, 2023 | $ | 325 |  |  | $ | 206 |  | $ | (25) |  | $ | 181 |  |  | $ | 506 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 + Details
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