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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Schedule of contributions to plans | Contributions to our plans were as follows:
|  |  | Quarter Ended March 31,
(dollars in millions) |  |  |  |  | 2021 |  | 2020
U.S. qualified defined benefit plans |  |  |  |  | $ | — |  |  | $ | — |
International defined benefit plans |  |  |  |  | 7 |  |  | 8 |
PRB plans |  |  |  |  | — |  |  | — |
Defined contribution plans |  |  |  |  | 271 |  |  | 213 |
Schedule of Amounts Recognized in Balance Sheet | Future pension and postretirement benefit obligations on the Condensed Consolidated Balance Sheet consists of the following:
(dollars in millions) | March 31, 2021 |  | December 31, 2020
Long-term pension liabilities | $ | 8,669 |  |  | $ | 9,131 |
Long-term PRB liabilities | 1,073 |  |  | 1,072 |
Other pension and PRB related items | 66 |  |  | 139 |
Total long-term pension and PRB liabilities | $ | 9,808 |  |  | $ | 10,342 |
Schedule of Net Benefit Costs | The following table illustrates the components of net periodic benefit (income) expense for our defined pension and PRB plans:
| Pension Benefits Quarter Ended March 31, |  | PRB Quarter Ended March 31,
(dollars in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Operating expense |  |  |  |  |  |  |
Service cost | $ | 131 |  |  | $ | 37 |  |  | $ | 2 |  |  | $ | 1 |
Non-operating expense |  |  |  |  |  |  |
Interest cost | 312 |  |  | 253 |  |  | 6 |  |  | 6 |
Expected return on plan assets | (868) |  |  | (521) |  |  | (5) |  |  | (1) |
Amortization of prior service cost (credit) | (42) |  |  | 13 |  |  | (1) |  |  | (1) |
Recognized actuarial net loss (gain) | 109 |  |  | 86 |  |  | (2) |  |  | (3) |
Net settlement and curtailment loss (gain) | — |  |  | — |  |  | — |  |  | — |
Non-service pension (income) expense | (489) |  |  | (169) |  |  | (2) |  |  | 1 |
Total net periodic benefit (income) expense | $ | (358) |  |  | $ | (132) |  |  | $ | — |  |  | $ | 2 |
Marketable Securities | The fair value of marketable securities held in trusts consisted of the following:
(dollars in millions) | March 31, 2021 |  | December 31, 2020
Marketable securities held in trusts | $ | 879 |  |  | $ | 881 |

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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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