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Capital structure and financing - C.6. Net finnacial obligations, table 2 (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Changes in liabilities arising from financing activities [abstract] |  |
Interest accretion, liabilities arising form financing activities | $ 17 | $ 8
Transfers, liabilities arising form financing activities | 3 | 3
Other non-cash movements, liabilities arising form financing activities | (10) | (14)
Changes In Net Debt [Abstract] |  |
Net debt | 5,902 | 4,596
Cash flows, net debt | (121) | 998
Scope changes, net debt | 0 | 269
Additions/acquisitions, net debt | 68 | 109
Foreign exchange movements, net debt | (22) | (14)
Transfers (to)/from assets held for sale, net debt | 0 | (52)
Net debt | 5,837 | 5,902
Bond and bank debt and financing |  |
Changes in liabilities arising from financing activities [abstract] |  |
Liabilities arising from financing activities, beginning of period | 5,972 | 4,227
Cash flows, liabilities arising form financing activities | (274) | 1,743
Scope changes, liabilities arising form financing activities | 0 | 74
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired | 0 | 0
Interest accretion, liabilities arising form financing activities | 16 | 8
Foreign exchange movements, liabilities arising form financing activities | (10) | (16)
Transfers (to)/from assets held for sale, liabilities arising form financing activities | 0 | (53)
Transfers, liabilities arising form financing activities | (3) | 3
Other non-cash movements, liabilities arising form financing activities | (10) | (14)
Liabilities arising from financing activities, end of period | 5,691 | 5,972
Lease liabilities [member] |  |
Changes in liabilities arising from financing activities [abstract] |  |
Liabilities arising from financing activities, beginning of period | 1,096 | 898
Cash flows, liabilities arising form financing activities | (121) | (107)
Scope changes, liabilities arising form financing activities | 0 | 210
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired | 68 | 109
Interest accretion, liabilities arising form financing activities | 1 | 0
Foreign exchange movements, liabilities arising form financing activities | (30) | (6)
Transfers (to)/from assets held for sale, liabilities arising form financing activities | 0 | (8)
Transfers, liabilities arising form financing activities | 6 | 0
Other non-cash movements, liabilities arising form financing activities | 0 | 0
Liabilities arising from financing activities, end of period | 1,021 | 1,096
Cash and cash equivalents |  |
Assets For Calculation Of Net Debt [Abstract] |  |
Assets, beginning of period | 1,164 | 528
Cash flows, assets | (272) | 638
Additions/acquisitions, assets | 0 | 0
Foreign exchange movements, assets | (17) | (8)
Transfers (to)/from assets held for sale. assets | 0 | (9)
Assets, end of period | 875 | 1,164
Changes in liabilities arising from financing activities [abstract] |  |
Scope changes, liabilities arising form financing activities |  | 16
Changes In Net Debt [Abstract] |  |
Scope changes, net debt | 0 |
Other |  |
Assets For Calculation Of Net Debt [Abstract] |  |
Assets, beginning of period | 2 | 2
Cash flows, assets | (2) | 0
Foreign exchange movements, assets |  | 0
Transfers (to)/from assets held for sale. assets |  | 0
Assets, end of period | 0 | 2
Changes in liabilities arising from financing activities [abstract] |  |
Scope changes, liabilities arising form financing activities |  | $ 0
Changes In Net Debt [Abstract] |  |
Scope changes, net debt | $ 0 |

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