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Employee Benefits - Obligations (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plan |  |  |
Change in Benefit Obligation: |  |  |
Benefit obligation at beginning of year | $ 116,000,000 | $ 158,000,000 |
Interest cost | 5,000,000 | 4,000,000 | $ 4,000,000
Actuarial gain | 2,000,000 | (38,000,000) |
Annuity payments | (7,000,000) | (7,000,000) |
Settlements | (1,000,000) | (1,000,000) |
Benefit obligation at end of year | 115,000,000 | 116,000,000 | 158,000,000
Change in Plan Assets: |  |  |
Fair value of assets at beginning of year | 228,000,000 | 283,000,000 |
Actual return (loss) on plan assets | 33,000,000 | (47,000,000) |
Annuity payments | 7,000,000 | 7,000,000 |
Settlements | (1,000,000) | (1,000,000) |
Fair value of assets at end of year | 253,000,000 | 228,000,000 | 283,000,000
Funded status | 138,000,000 | 112,000,000 |
Changes recognized in other comprehensive income for the year ended December 31: |  |  |
Amortization of actuarial gain (loss) | (7,000,000) | (2,000,000) |
Amortization of prior service cost |  | 0 |
Net actuarial (gain) loss arising during the year | (18,000,000) | 26,000,000 |
Total recognized in other comprehensive income for the year (pre-tax) | (25,000,000) | 24,000,000 |
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31: |  |  |
Actuarial (gain) loss, net | (41,000,000) | (66,000,000) |
Total accumulated other comprehensive loss (pre-tax) | 41,000,000 | 66,000,000 |
Post-Retirement Health and Welfare Benefits |  |  |
Change in Benefit Obligation: |  |  |
Benefit obligation at beginning of year | 7,000,000 | 10,000,000 |
Interest cost | 1,000,000 | 0 |
Actuarial gain | 1,000,000 | (2,000,000) |
Annuity payments | (1,000,000) | (1,000,000) |
Benefit obligation at end of year | 8,000,000 | 7,000,000 | 10,000,000
Change in Plan Assets: |  |  |
Fair value of assets at beginning of year | 0 | 0 |
Employer contribution | 1,000,000 | 1,000,000 |
Annuity payments | 1,000,000 | 1,000,000 |
Fair value of assets at end of year | 0 | 0 | $ 0
Funded status | (8,000,000) | (7,000,000) |
Changes recognized in other comprehensive income for the year ended December 31: |  |  |
Amortization of actuarial gain (loss) |  | 0 |
Amortization of prior service cost |  | 0 |
Net actuarial (gain) loss arising during the year | 1,000,000 | (2,000,000) |
Total recognized in other comprehensive income for the year (pre-tax) | 1,000,000 | (2,000,000) |
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31: |  |  |
Prior service cost |  | 0 |
Actuarial (gain) loss, net | (1,000,000) | (2,000,000) |
Total accumulated other comprehensive loss (pre-tax) | $ (1,000,000) | $ (2,000,000) |

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