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Capital structure and financing - C.5. Net debt, table 2 (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in liabilities arising from financing activities [abstract] |  |  |
Additions, liabilities arising form financing activities | $ (43) | $ 192 | $ 1
Interest accretion, liabilities arising form financing activities | 11 | 7 |
Transfers, liabilities arising form financing activities | (9) | 9 |
Other non-cash movements, liabilities arising form financing activities | (19) | (101) |
Changes In Net Debt [Abstract] |  |  |
Net debt | 3,164 | 3,250 |
Additions/acquisitions, net debt | 44 | 220 |
Cash flows, net debt | 676 | (209) |
Scope changes, net debt | 260 |  |
Foreign exchange movements, net debt | (72) | 28 |
Transfers (to)/from assets held for sale, net debt | (4) | (42) |
Net debt | 4,051 | 3,164 | 3,250
Bond and bank debt and financing |  |  |
Changes in liabilities arising from financing activities [abstract] |  |  |
Liabilities arising from financing activities, beginning of period | 3,420 | 3,606 |
Cash flows, liabilities arising form financing activities | 621 | (177) |
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired |  | 3 |
Scope changes, liabilities arising form financing activities | 267 |  |
Interest accretion, liabilities arising form financing activities | 11 | 8 |
Foreign exchange movements, liabilities arising form financing activities | (84) | 34 |
Transfers (to)/from assets held for sale, liabilities arising form financing activities | 9 | (49) |
Transfers, liabilities arising form financing activities | 3 | 10 |
Other non-cash movements, liabilities arising form financing activities | (19) | (14) |
Liabilities arising from financing activities, end of period | 4,227 | 3,420 | 3,606
Finance lease liabilities |  |  |
Changes in liabilities arising from financing activities [abstract] |  |  |
Liabilities arising from financing activities, beginning of period | 365 | 295 |
Cash flows, liabilities arising form financing activities | (17) | (22) |
Additions, liabilities arising form financing activities | 44 |  |
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired |  | 195 |
Interest accretion, liabilities arising form financing activities |  | (1) |
Foreign exchange movements, liabilities arising form financing activities | (21) | (2) |
Transfers (to)/from assets held for sale, liabilities arising form financing activities | (8) | (13) |
Transfers, liabilities arising form financing activities | (11) | 0 |
Other non-cash movements, liabilities arising form financing activities |  | (86) |
Liabilities arising from financing activities, end of period | 353 | 365 | 295
Cash and cash equivalents |  |  |
Assets For Calculation Of Net Debt [Abstract] |  |  |
Assets, beginning of period | 619 | 646 |
Cash flows, assets | (72) | 10 |
Additions/acquisitions, assets |  | (22) |
Scope Changes, assets | 7 |  |
Foreign exchange movements, assets | (33) | 4 |
Transfers (to)/from assets held for sale. assets | 6 | (19) |
Assets, end of period | 528 | 619 | 646
Other |  |  |
Assets For Calculation Of Net Debt [Abstract] |  |  |
Assets, beginning of period | 2 | 4 |
Cash flows, assets |  | (1) |
Foreign exchange movements, assets |  | 0 |
Transfers (to)/from assets held for sale. assets |  | (2) |
Assets, end of period | $ 2 | $ 2 | $ 4

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