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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | Net periodic (benefit) cost included in “General and administrative expenses” includes the following components:
| Three Months Ended March 31,
| Pension Benefits |  | Other Postretirement Benefits
| 2021 |  | 2020 |  | 2021 |  | 2020
| (in millions)
Components of net periodic (benefit) cost: |  |  |  |  |  |  |
Service cost | $ | 83 |  |  | $ | 80 |  |  | $ | 6 |  |  | $ | 6 |
Interest cost | 90 |  |  | 108 |  |  | 12 |  |  | 16 |
Expected return on plan assets | (205) |  |  | (201) |  |  | (25) |  |  | (25) |
Amortization of prior service cost | (1) |  |  | (1) |  |  | 2 |  |  | 2 |
Amortization of actuarial (gain) loss, net | 62 |  |  | 65 |  |  | 4 |  |  | 4 |
Settlements | 1 |  |  | 0 |  |  | 0 |  |  | 0 |
Special termination benefits(1) | 1 |  |  | 2 |  |  | 0 |  |  | 0 |
Net periodic (benefit) cost | $ | 31 |  |  | $ | 53 |  |  | $ | (1) |  |  | $ | 3 |
__________ (1)For 2020 and 2021, certain employees were provided special termination benefits under non-qualified plans in the form of unreduced early retirement benefits as a result of their involuntary termination or participation in the Voluntary Separation Program that was offered to eligible U.S.-based employees in 2019.

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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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