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Postretirement benefits (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] | 9. Postretirement benefits The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:
| Pension Benefits |  |  | Other Postretirement Benefits |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Three Months Ended September 30 | U.S. Plans |  |  | Non-U.S. Plans |  |  | U.S. Plans |  |  | Non-U.S. Plans |  |  |  |  |
(in millions of U.S. dollars) |  |  |  |
Service cost | $ | 14 |  |  | $ | 3 |  |  | $ | 15 |  |  | $ | 6 |  |  | $ | 1 |  |  | $ | — |
Interest cost | 26 |  |  | 6 |  |  | 27 |  |  | 6 |  |  | 1 |  |  | 2 |
Expected return on plan assets | (53 | ) |  | (12 | ) |  | (47 | ) |  | (11 | ) |  | (2 | ) |  | (2 | )
Amortization of net actuarial loss | — |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | — |  |  | (21 | ) |  | (22 | )
Curtailments | — |  |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | (32 | )
Settlements | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic (benefit) cost | $ | (13 | ) |  | $ | (2 | ) |  | $ | (5 | ) |  | $ | 2 |  |  | $ | (22 | ) |  | $ | (54 | )
| Pension Benefits |  |  | Other Postretirement Benefits |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Nine Months Ended September 30 | U.S. Plans |  |  | Non-U.S. Plans |  |  | U.S. Plans |  |  | Non-U.S. Plans |  |  |  |  |
(in millions of U.S. dollars) |  |  |  |
Service cost | $ | 43 |  |  | $ | 9 |  |  | $ | 47 |  |  | $ | 14 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost | 79 |  |  | 20 |  |  | 79 |  |  | 20 |  |  | 3 |  |  | 3 |
Expected return on plan assets | (159 | ) |  | (38 | ) |  | (142 | ) |  | (31 | ) |  | (4 | ) |  | (4 | )
Amortization of net actuarial loss | — |  |  | 1 |  |  | — |  |  | 2 |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | — |  |  | (64 | ) |  | (68 | )
Curtailments | — |  |  | — |  |  | — |  |  | (8 | ) |  | (2 | ) |  | (32 | )
Settlements | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic (benefit) cost | $ | (36 | ) |  | $ | (8 | ) |  | $ | (16 | ) |  | $ | (3 | ) |  | $ | (66 | ) |  | $ | (99 | )
The non-service cost components of net periodic (benefit) cost are included in Losses and loss expenses and Administrative expenses in the Consolidated statements of operations.

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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=108410482&loc=d3e1928-114920 + Details
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