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Postretirement benefits Postretirement benefits | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Compensation and Employee Benefit Plans [Text Block] | 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:
| 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 The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration