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Postretirement benefits (Tables) | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] | The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows:
| Three Months Ended June 30 |
| Pension Benefits |  |  | Other Postretirement Benefits |
| U.S. Plans |  |  | Non-U.S. Plans |  |  | Total |  |  | U.S. Plans |  |  | Non-U.S. Plans |  |  | Total |
(in millions of U.S. dollars) |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 16 |  |  | $ | 4 |  |  | $ | 20 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost | 26 |  |  | 7 |  |  | 33 |  |  | — |  |  | — |  |  | — |
Expected return on plan assets | (48 | ) |  | (10 | ) |  | (58 | ) |  | (1 | ) |  | — |  |  | (1 | )
Amortization of net actuarial loss | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | (23 | ) |  | — |  |  | (23 | )
Curtailments | — |  |  | (8 | ) |  | (8 | ) |  | — |  |  | — |  |  | — |
Net periodic (benefit) cost | $ | (6 | ) |  | $ | (6 | ) |  | $ | (12 | ) |  | $ | (23 | ) |  | $ | 1 |  |  | $ | (22 | )
2016 |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 20 |  |  | $ | 4 |  |  | $ | 24 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 3 |
Interest cost | 27 |  |  | 8 |  |  | 35 |  |  | 4 |  |  | — |  |  | 4 |
Expected return on plan assets | (42 | ) |  | (10 | ) |  | (52 | ) |  | (2 | ) |  | — |  |  | (2 | )
Amortization of net actuarial loss | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
Net periodic cost | $ | 5 |  |  | $ | 3 |  |  | $ | 8 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 5 |
| Six Months Ended June 30 |
| Pension Benefits |  |  | Other Postretirement Benefits |
| U.S. Plans |  |  | Non-U.S. Plans |  |  | Total |  |  | U.S. Plans |  |  | Non-U.S. Plans |  |  | Total |
(in millions of U.S. dollars) |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 32 |  |  | $ | 8 |  |  | $ | 40 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost | 52 |  |  | 14 |  |  | 66 |  |  | 1 |  |  | — |  |  | 1 |
Expected return on plan assets | (95 | ) |  | (20 | ) |  | (115 | ) |  | (2 | ) |  | — |  |  | (2 | )
Amortization of net actuarial loss | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | (46 | ) |  | — |  |  | (46 | )
Curtailments | — |  |  | (8 | ) |  | (8 | ) |  | — |  |  | — |  |  | — |
Net periodic (benefit) cost | $ | (11 | ) |  | $ | (5 | ) |  | $ | (16 | ) |  | $ | (46 | ) |  | $ | 1 |  |  | $ | (45 | )
2016 |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 37 |  |  | $ | 9 |  |  | $ | 46 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 5 |
Interest cost | 54 |  |  | 16 |  |  | 70 |  |  | 9 |  |  | — |  |  | 9 |
Expected return on plan assets | (79 | ) |  | (20 | ) |  | (99 | ) |  | (4 | ) |  | — |  |  | (4 | )
Amortization of net actuarial loss | — |  |  | 2 |  |  | 2 |  |  | — |  |  | — |  |  | — |
Net periodic cost | $ | 12 |  |  | $ | 7 |  |  | $ | 19 |  |  | $ | 9 |  |  | $ | 1 |  |  | $ | 10 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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