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Performance B.4.2. Pension and other long-term employee benefit plans (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) year | Dec. 31, 2017 USD ($) year
Long-Service Plans |  |
Disclosure of defined benefit plans [line items] |  |
Requisite service period | 5 years |
Termination Plans |  |
Disclosure of defined benefit plans [line items] |  |
Net defined benefit liability | $ 60 | $ 66
Estimate of contributions expected to be paid to plan in future years | $ 111 | $ 87
Weighted average duration of defined benefit obligation | year | 7 | 7
Bottom of range | Long-Service Plans |  |
Disclosure of defined benefit plans [line items] |  |
Requisite service period, additional bonus | 5 years |
Top of range | Long-Service Plans |  |
Disclosure of defined benefit plans [line items] |  |
Requisite service period, additional bonus | 40 years |

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