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Additional disclosure items G.3.2. Tax related risks and uncertain tax position (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of other provisions [line items] |  |
Uncertain tax positions, remote risk | 20.00% |
Uncertain tax positions, probable risk | 50.00% |
Provision for taxes other than income tax |  |
Disclosure of other provisions [line items] |  |
Other provisions | $ 77 | $ 50
Tax contingent liability |  |
Disclosure of other provisions [line items] |  |
Estimated financial effect of contingent liabilities | 339 | 300
Joint ventures | Provision for taxes other than income tax |  |
Disclosure of other provisions [line items] |  |
Other provisions | 7 | 4
Joint ventures | Tax contingent liability |  |
Disclosure of other provisions [line items] |  |
Estimated financial effect of contingent liabilities | $ 69 | $ 49
Bottom of range |  |
Disclosure of other provisions [line items] |  |
Uncertain tax positions, possible risk | 21.00% |
Top of range |  |
Disclosure of other provisions [line items] |  |
Uncertain tax positions, possible risk | 49.00% |

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