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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Retirement Benefits [Abstract] |
Schedule of Changes in Benefit Obligation and Plan Assets | Table 14.1: Changes in Benefit Obligation and Plan Assets
|  | Defined Pension Benefits |  | Other Postretirement Benefits
(Dollars in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Change in benefit obligation: |  |  |  |  |  |  |  |
Accumulated benefit obligation as of January 1, |  | $ | 178 |  |  | $ | 165 |  |  | $ | 21 |  |  | $ | 27 |
Service cost |  | 1 |  |  | 1 |  |  | 0 |  |  | 0 |
Interest cost |  | 4 |  |  | 5 |  |  | 0 |  |  | 1
Benefits paid |  | (12) |  |  | (11) |  |  | (2) |  |  | (2) |
Actuarial loss (gain) |  | (8) |  |  | 18 |  |  | (3) |  |  | (5) |
Accumulated benefit obligation as of December 31, |  | $ | 163 |  |  | $ | 178 |  |  | $ | 16 |  |  | $ | 21 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets as of January 1, |  | $ | 274 |  |  | $ | 254 |  |  | $ | 6 |  |  | $ | 6 |
Actual return on plan assets |  | 10 |  |  | 30 |  |  | 1 |  |  | 1 |
Employer contributions |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |
Benefits paid |  | (12) |  |  | (11) |  |  | (2) |  |  | (2) |
Fair value of plan assets as of December 31, |  | $ | 273 |  |  | $ | 274 |  |  | $ | 6 |  |  | $ | 6 |
Over (under) funded status as of December 31, |  | $ | 110 |  |  | $ | 96 |  |  | $ | (10) |  |  | $ | (15) |
|  | Defined Pension Benefits |  | Other Postretirement Benefits
(Dollars in millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Balance sheet presentation as of December 31, |  |  |  |  |  |  |  |
Other assets |  | $ | 121 |  |  | $ | 108 |  |  | $ | 0 |  |  | $ | 0 |
Other liabilities |  | (11) |  |  | (12) |  |  | (10) |  |  | (15) |
Net amount recognized as of December 31, |  | $ | 110 |  |  | $ | 96 |  |  | $ | (10) |  |  | $ | (15) |

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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(b)(c) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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