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Guarantees, commitments and risks (Details 6) € in Millions | Dec. 31, 2017 EUR (€)
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Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | € 129,949 |
Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 128 |
Operating lease obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 4,532 | [1]
Decommissioning liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 14,786 | [2]
Environmental liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2,673 |
Purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 107,830 | [3]
Purchase obligations [Member] | Take-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 100,244 |
Purchase obligations [Member] | Ship-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 4,687 |
Purchase obligations [Member] | Other purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2,310 | [4]
Purchase obligations [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 128 |
Purchase obligations [Member] | Other ship-or-pay obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 589 |
Maturity Year One [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 12,548 |
Maturity Year One [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 11 |
Maturity Year One [Member] | Operating lease obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 883 | [1]
Maturity Year One [Member] | Decommissioning liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 348 | [2]
Maturity Year One [Member] | Environmental liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 317 |
Maturity Year One [Member] | Purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 10,989 | [3]
Maturity Year One [Member] | Purchase obligations [Member] | Take-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 8,644 |
Maturity Year One [Member] | Purchase obligations [Member] | Ship-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,272 |
Maturity Year One [Member] | Purchase obligations [Member] | Other purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 963 | [4]
Maturity Year One [Member] | Purchase obligations [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 11 |
Maturity Year One [Member] | Purchase obligations [Member] | Other ship-or-pay obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 110 |
Maturity Year Two [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 11,112 |
Maturity Year Two [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 3 |
Maturity Year Two [Member] | Operating lease obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 525 | [1]
Maturity Year Two [Member] | Decommissioning liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 411 | [2]
Maturity Year Two [Member] | Environmental liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 311 |
Maturity Year Two [Member] | Purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 9,862 | [3]
Maturity Year Two [Member] | Purchase obligations [Member] | Take-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 8,708 |
Maturity Year Two [Member] | Purchase obligations [Member] | Ship-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 760 |
Maturity Year Two [Member] | Purchase obligations [Member] | Other purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 295 | [4]
Maturity Year Two [Member] | Purchase obligations [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 3 |
Maturity Year Two [Member] | Purchase obligations [Member] | Other ship-or-pay obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 99 |
Maturity Year Three [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 9,390 |
Maturity Year Three [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2 |
Maturity Year Three [Member] | Operating lease obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 485 | [1]
Maturity Year Three [Member] | Decommissioning liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 398 | [2]
Maturity Year Three [Member] | Environmental liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 282 |
Maturity Year Three [Member] | Purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 8,223 | [3]
Maturity Year Three [Member] | Purchase obligations [Member] | Take-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 7,452 |
Maturity Year Three [Member] | Purchase obligations [Member] | Ship-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 516 |
Maturity Year Three [Member] | Purchase obligations [Member] | Other purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 168 | [4]
Maturity Year Three [Member] | Purchase obligations [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2 |
Maturity Year Three [Member] | Purchase obligations [Member] | Other ship-or-pay obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 87 |
Maturity Year Four [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 9,209 |
Maturity Year Four [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2 |
Maturity Year Four [Member] | Operating lease obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 371 | [1]
Maturity Year Four [Member] | Decommissioning liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 375 | [2]
Maturity Year Four [Member] | Environmental liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 228 |
Maturity Year Four [Member] | Purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 8,233 | [3]
Maturity Year Four [Member] | Purchase obligations [Member] | Take-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 7,542 |
Maturity Year Four [Member] | Purchase obligations [Member] | Ship-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 468 |
Maturity Year Four [Member] | Purchase obligations [Member] | Other purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 150 | [4]
Maturity Year Four [Member] | Purchase obligations [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2 |
Maturity Year Four [Member] | Purchase obligations [Member] | Other ship-or-pay obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 73 |
Maturity Year Five [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 8,787 |
Maturity Year Five [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2 |
Maturity Year Five [Member] | Operating lease obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 329 | [1]
Maturity Year Five [Member] | Decommissioning liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 207 | [2]
Maturity Year Five [Member] | Environmental liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 178 |
Maturity Year Five [Member] | Purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 8,071 | [3]
Maturity Year Five [Member] | Purchase obligations [Member] | Take-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 7,553 |
Maturity Year Five [Member] | Purchase obligations [Member] | Ship-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 380 |
Maturity Year Five [Member] | Purchase obligations [Member] | Other purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 79 | [4]
Maturity Year Five [Member] | Purchase obligations [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2 |
Maturity Year Five [Member] | Purchase obligations [Member] | Other ship-or-pay obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 59 |
Maturity Year Five And Thereafter [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 78,903 |
Maturity Year Five And Thereafter [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 108 |
Maturity Year Five And Thereafter [Member] | Operating lease obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,939 | [1]
Maturity Year Five And Thereafter [Member] | Decommissioning liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 13,047 | [2]
Maturity Year Five And Thereafter [Member] | Environmental liabilities [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,357 |
Maturity Year Five And Thereafter [Member] | Purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 62,452 | [3]
Maturity Year Five And Thereafter [Member] | Purchase obligations [Member] | Take-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 60,345 |
Maturity Year Five And Thereafter [Member] | Purchase obligations [Member] | Ship-or-pay contracts Obligation [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,291 |
Maturity Year Five And Thereafter [Member] | Purchase obligations [Member] | Other purchase obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 655 | [4]
Maturity Year Five And Thereafter [Member] | Purchase obligations [Member] | Other Obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 108 |
Maturity Year Five And Thereafter [Member] | Purchase obligations [Member] | Other ship-or-pay obligations [Member] |  |
Statement Line Items [Line Items] |  |
Non-derivative financial liabilities, undiscounted cash flows | € 161 |
[1] | Operating leases primarily regarded assets for drilling activities, time charter and long term rentals of vessels, lands, service stations and office buildings. Such leases generally did not include renewal options. There are no significant restrictions provided by these operating leases which limit the ability of the Company to pay dividend, use assets or to take on new borrowings.
[2] | Represents the estimated future costs for the decommissioning of oil and natural gas production facilities at the end of the producing lives of fields, well-plugging, abandonment and site restoration.
[3] | Represents any agreement to purchase goods or services that is enforceable and legally binding and that specifies all significant terms.
[4] | Mainly refers to arrangements to purchase capacity entitlements at certain regasification facilities in the U.S. (&euro;948 million).

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