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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Schedule of contributions to plans | Contributions to our plans were as follows:
| Quarter Ended September 30, |  | Nine Months Ended September 30,
(dollars in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
U.S. qualified defined benefit plans | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
International defined benefit plans | 8 |  |  | 14 |  |  | 29 |  |  | 56 |
PRB plans | 5 |  |  | 8 |  |  | 9 |  |  | 8 |
Defined contribution plans | 221 |  |  | 228 |  |  | 730 |  |  | 668 |
Schedule of Amounts Recognized in Balance Sheet | The amounts recognized in the Condensed Consolidated Balance Sheet consist of:
(dollars in millions) | September 30, 2021 |  | December 31, 2020
Noncurrent pension assets (included in Other assets) | $ | 1,389 |  |  | $ | 424 |
Current pension and PRB liabilities (included in Accrued employee compensation) | 314 |  |  | 314 |
Future pension and postretirement benefit obligations | 9,742 |  |  | 10,342 |
The amounts recognized in Future pension and postretirement benefit obligations consist of:
(dollars in millions) | September 30, 2021 |  | December 31, 2020
Noncurrent pension liabilities | $ | 8,638 |  |  | $ | 9,131 |
Noncurrent PRB liabilities | 1,039 |  |  | 1,072 |
Other pension and PRB related items | 65 |  |  | 139 |
Future pension and postretirement benefit obligations | $ | 9,742 |  |  | $ | 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 September 30, |  | PRB Quarter Ended September 30,
(dollars in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Operating expense |  |  |  |  |  |  |
Service cost | $ | 131 |  |  | $ | 149 |  |  | $ | 2 |  |  | $ | 2 |
Non-operating expense |  |  |  |  |  |  |
Interest cost | 312 |  |  | 465 |  |  | 6 |  |  | 10 |
Expected return on plan assets | (869) |  |  | (827) |  |  | (5) |  |  | (4) |
Amortization of prior service cost (credit) | (42) |  |  | 13 |  |  | (1) |  |  | (1) |
Recognized actuarial net loss (gain) | 109 |  |  | 86 |  |  | (2) |  |  | (3) |
Net settlement, curtailment and special termination benefit loss | 1 |  |  | 8 |  |  | — |  |  | — |
Non-service pension (income) expense | (489) |  |  | (255) |  |  | (2) |  |  | 2 |
Total net periodic benefit (income) expense | $ | (358) |  |  | $ | (106) |  |  | $ | — |  |  | $ | 4 |
| Pension Benefits Nine Months Ended September 30, |  | PRB Nine Months Ended September 30,
(dollars in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Operating expense |  |  |  |  |  |  |
Service cost | $ | 393 |  |  | $ | 328 |  |  | $ | 6 |  |  | $ | 5 |
Non-operating expense |  |  |  |  |  |  |
Interest cost | 937 |  |  | 1,170 |  |  | 18 |  |  | 26 |
Expected return on plan assets | (2,608) |  |  | (2,162) |  |  | (15) |  |  | (9) |
Amortization of prior service cost (credit) | (126) |  |  | 39 |  |  | (3) |  |  | (3) |
Recognized actuarial net loss (gain) | 327 |  |  | 255 |  |  | (6) |  |  | (9) |
Net settlement, curtailment and special termination benefit loss | 4 |  |  | 35 |  |  | — |  |  | — |
Non-service pension (income) expense | (1,466) |  |  | (663) |  |  | (6) |  |  | 5 |
Total net periodic benefit (income) expense | $ | (1,073) |  |  | $ | (335) |  |  | $ | — |  |  | $ | 10 |
Marketable Securities | The fair value of marketable securities held in trusts was as follows:
(dollars in millions) | September 30, 2021 |  | December 31, 2020
Marketable securities held in trusts | $ | 965 |  |  | $ | 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=123447040&loc=d3e1928-114920 + Details
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