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Employee Benefits (Tables) | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Pension Benefit (Income) Expense and Post-retirement Benefit Expense | Net periodic benefit income for the Lumen Combined Pension Plan ("Combined Pension Plan") includes the following components:
| Combined Pension Plan
| Three Months Ended March 31,
| 2021 |  | 2020
| (Dollars in millions)
Service cost | $ | 13 |  |  | 16 |
Interest cost | 50 |  |  | 82 |
Expected return on plan assets | (138) |  |  | (149) |
Recognition of prior service credit | (2) |  |  | (3) |
Recognition of actuarial loss | 49 |  |  | 50 |
Net periodic pension benefit income | $ | (28) |  |  | (4) |
Net periodic benefit expense for our post-retirement benefit plans includes the following components:
| Post-Retirement Benefit Plans
| Three Months Ended March 31,
| 2021 |  | 2020
| (Dollars in millions)
Service cost | $ | 4 |  |  | 4 |
Interest cost | 12 |  |  | 20 |
Recognition of prior service cost | 4 |  |  | 4 |
Recognition of actuarial loss | 1 |  |  | — |
Net periodic post-retirement benefit expense | $ | 21 |  |  | 28 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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