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Details to the consolidated cash flow statements (Details 6) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 08, 2019 | Jan. 01, 2019
Statement [line items] |  |  |  |  |
Financial debts and derivative instruments at beginning of period | $ 27,384 |  | $ 28,532 |  |
Impact of adoption of IFRS 16 Leases | 2,005 | $ 1,949 |  |  | $ 1,736
Increase in non-current financial debts | 7,126 | 93 | 2,856 |  |
Repayments of non-current financial debts | (2,003) | (3,195) | (366) |  |
Change in current financial debts | 2,261 | (1,582) | 1,687 |  |
Payments of lease liabilities, net | (312) | (273) |  |  |
Impact of business combinations and divestments |  |  | 14 |  |
Changes in fair values, and other changes, net |  |  | (43) |  |
Amortization of bonds discount |  |  | 29 |  |
Currency translation effects |  |  | (555) |  |
Financial debts and derivative instruments at end of period | 36,044 | 27,384 |  |  |
Non-current financial debts [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Financial debts and derivative instruments at beginning of period | 20,353 | 22,470 | 23,224 |  |
Increase in non-current financial debts | 7,126 | 93 | 2,856 |  |
Impact of business combinations and divestments |  |  | 10 |  |
Changes in fair values, and other changes, net | (1) |  | 5 |  |
Amortization of bonds discount | 16 | 25 | 27 |  |
Currency translation effects | 832 | (141) | (462) |  |
Reclassification from non-current to current, net | (2,067) | (2,003) |  |  |
Current portion of non-current financial debt |  |  | (3,190) |  |
Financial debts and derivative instruments at end of period | 26,259 | 20,353 | 22,470 |  |
Current financial debts and derivative financial instruments [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Financial debts and derivative instruments at beginning of period | 7,031 | 9,678 | 5,308 |  |
Repayments of non-current financial debts | (2,003) | (3,195) | (366) |  |
Change in current financial debts | 2,261 | (1,582) | 1,681 |  |
Impact of business combinations and divestments | 32 | 2 | 4 |  |
Changes in fair values, and other changes, net |  | 129 | (48) |  |
Amortization of bonds discount | 5 |  | 2 |  |
Currency translation effects | 392 | 44 | (93) |  |
Reclassification from non-current to current, net | 2,067 | 2,003 |  |  |
Current portion of non-current financial debt |  |  | 3,190 |  |
Financial debts and derivative instruments at end of period | 9,785 | 7,031 | 9,678 |  |
Non-current lease liabilities [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Financial debts and derivative instruments at beginning of period | 1,703 |  |  |  |
New leases | 221 | 362 |  |  |
Impact of business combinations and divestments | 36 | (11) |  |  |
Changes in fair values, and other changes, net | (30) | 33 |  |  |
Currency translation effects | 39 | 4 |  |  |
Reclassification from non-current to current, net | (250) | (156) |  |  |
Financial debts and derivative instruments at end of period | 1,719 | 1,703 |  |  |
Current lease liabilities [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Financial debts and derivative instruments at beginning of period | 246 |  |  |  |
Payments of lease liabilities, net | (312) | (273) |  |  |
Interest payments for amounts included in lease liabilities classified as cash flows from operating activities | (56) | (51) |  |  |
New leases | 73 | 131 |  |  |
Impact of business combinations and divestments | 8 | (6) |  |  |
Changes in fair values, and other changes, net | 65 | 20 |  |  |
Currency translation effects | 12 | 1 |  |  |
Reclassification from non-current to current, net | 250 | 156 |  |  |
Financial debts and derivative instruments at end of period | $ 286 | 246 |  |  |
Continuing operations |  |  |  |  |
Statement [line items] |  |  |  |  |
Change in current financial debts |  |  | $ 1,687 |  |
Continuing operations | Non-current financial debts [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Lease liabilities, impact of adoption of IFRS 16 |  |  |  |  | (2)
Continuing operations | Current financial debts and derivative financial instruments [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Lease liabilities, impact of adoption of IFRS 16 |  |  |  |  | (1)
Continuing operations | Non-current lease liabilities [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Lease liabilities, impact of adoption of IFRS 16 |  |  |  |  | 1,471
Continuing operations | Current lease liabilities [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Lease liabilities, impact of adoption of IFRS 16 |  |  |  |  | 268
Discontinued operations |  |  |  |  |
Statement [line items] |  |  |  |  |
Impact of adoption of IFRS 16 Leases |  |  |  | $ 269 | 286
Discontinued operations | Non-current financial debts [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Lease liabilities, impact of adoption of IFRS 16 |  |  |  |  | (89)
Discontinued operations | Current financial debts and derivative financial instruments [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Financial debts and lease liabilities related to discontinued operations |  | (47) |  |  |
Discontinued operations | Non-current lease liabilities [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Lease liabilities, impact of adoption of IFRS 16 |  |  |  |  | 246
Financial debts and lease liabilities related to discontinued operations |  | (246) |  |  |
Discontinued operations | Current lease liabilities [member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Lease liabilities, impact of adoption of IFRS 16 |  |  |  |  | $ 40
Financial debts and lease liabilities related to discontinued operations |  | $ (40) |  |  |

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