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Post-Employment Benefits (Tables) | 6 Months Ended
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Jun. 30, 2021
Post-Employment Benefits |
Schedule of components of the net periodic benefit cost for the entity's major defined benefit plans and post-employment medical and dental benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Defined Benefit Plans | ​ | Medical and Dental Plans
​ | ​ | Three Months | ​ | Six Months | ​ | Three Months | ​ | Six Months
(in millions) | ​ | Ended June 30 | ​ | Ended June 30 | ​ | Ended June 30 | ​ | Ended June 30
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost — benefits earned during the period | ​ | $ | 96 | ​ | $ | 81 | ​ | $ | 196 | ​ | $ | 166 | ​ | $ | 14 | ​ | $ | 11 | ​ | $ | 28 | ​ | $ | 23
Interest cost on projected benefit obligations | ​ |  | 62 | ​ |  | 74 | ​ |  | 124 | ​ |  | 149 | ​ |  | 9 | ​ |  | 9 | ​ |  | 17 | ​ |  | 21
Expected return on plan assets | ​ |  | (211) | ​ |  | (191) | ​ |  | (422) | ​ |  | (383) | ​ |  | (7) | ​ |  | (7) | ​ |  | (14) | ​ |  | (14)
Net amortization of: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Actuarial loss, net | ​ |  | 78 | ​ |  | 64 | ​ |  | 159 | ​ |  | 127 | ​ |  | 7 | ​ |  | 2 | ​ |  | 14 | ​ |  | 10
Prior service cost (credit) | ​ |  | 1 | ​ |  | 1 | ​ |  | 1 | ​ |  | 1 | ​ |  | (7) | ​ |  | (7) | ​ |  | (14) | ​ |  | (14)
Net cost — continuing operations | ​ | $ | 26 | ​ | $ | 29 | ​ | $ | 58 | ​ | $ | 60 | ​ | $ | 16 | ​ | $ | 8 | ​ | $ | 31 | ​ | $ | 26
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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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