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Deferred tax assets and liabilities (Tables ) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Deferred Tax [Abstract] |
Disclosure of detailed information about Deferred tax assets and liabilities [text block] |
(€ million) |  | December 31, 2018 |  | December 31, 2017
Deferred tax liabilities, gross |  |  | 7,956 |  |  |  | 10,169 |
Deferred tax assets available for offset |  |  | (3,684) |  |  |  | (4,269 | )
Deferred tax liabilities |  |  | 4,272 |  |  |  | 5,900 |
Deferred tax assets, gross (net of accumulated write-down provisions) |  |  | 7,615 |  |  |  | 8,347 |
Deferred tax liabilities available for offset |  |  | (3,684) |  |  |  | (4,269 | )
Deferred tax assets |  |  | 3,931 |  |  |  | 4,078 |
Disclosure of temporary difference, unused tax losses and unused tax credits [text block] | The most significant temporary differences giving rise to net deferred tax liabilities are disclosed below:
(€ million) |  | Carrying amount at December 31, 2018 |  |  | Carrying amount at December 31, 2017 |
Deferred tax liabilities |  |  |  |  |  |  |  |
Accelerated tax depreciation |  |  | 6,612 |  |  |  | 8,323 |
Difference between the fair value and the carrying amount of assets acquired |  |  | 849 |  |  |  | 1,106 |
Site restoration and abandonment (tangible assets) |  |  | 85 |  |  |  | 305 |
Application of the weighted average cost method in evaluation of inventories |  |  | 44 |  |  |  | 70 |
Other |  |  | 366 |  |  |  | 365 |
|  |  | 7,956 |  |  |  | 10,169 |
Deferred tax assets, gross |  |  |  |  |  |  |  |
Carry-forward tax losses |  |  | (5,528 | ) |  |  | (5,240 | )
Site restoration and abandonment (provisions for contingencies) |  |  | (1,986 | ) |  |  | (2,747 | )
Timing differences on depreciation and amortization |  |  | (2,104 | ) |  |  | (2,164 | )
Accruals for impairment losses and provisions for contingencies |  |  | (1,460 | ) |  |  | (1,404 | )
Impairment losses |  |  | (792 | ) |  |  | (801 | )
Over/Under lifting |  |  | (604 | ) |  |  | (395 | )
Employee benefits |  |  | (212 | ) |  |  | (194 | )
Unrealized intercompany profits |  |  | (124 | ) |  |  | (130 | )
Other |  |  | (546 | ) |  |  | (534 | )
|  |  | (13,356 | ) |  |  | (13,609 | )
Accumulated write-downs of deferred tax assets |  |  | 5,741 |  |  |  | 5,262 |
Deferred tax assets, net |  |  | (7,615 | ) |  |  | (8,347 | )
Disclosure of reconciliation of changes in deferred tax liability assets [text block] | The following table summarizes the changes in deferred tax liabilities and assets:
(€ million) |  | Deferred tax liabilities |  | Deferred tax assets, gross |  | Accumulated write-downs of deferred tax assets |  | Deferred tax assets, net of impairments
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount – beginning of the year |  |  | 10,169 |  |  |  | (13,609 | ) |  |  | 5,262 |  |  |  | (8,347 | )
Changes in accounting principles (IFRS 15) |  |  | 37 |  |  |  | (237 | ) |  |  |  |  |  |  | (237 | )
Carrying amount restated – beginning of the year |  |  | 10,206 |  |  |  | (13,846 | ) |  |  | 5,262 |  |  |  | (8,584 | )
Additions |  |  | 1,147 |  |  |  | (1,478 | ) |  |  | 253 |  |  |  | (1,225 | )
Deductions |  |  | (802 | ) |  |  | 1,523 |  |  |  | (43 | ) |  |  | 1,480 |
Currency translation differences |  |  | 283 |  |  |  | (278 | ) |  |  | 71 |  |  |  | (207 | )
Decrease through loss of control of subsidiary |  |  | (2,778 | ) |  |  | 813 |  |  |  |  |  |  |  | 813 |
Other changes |  |  | (100 | ) |  |  | (90 | ) |  |  | 198 |  |  |  | 108 |
Carrying amount at the end of the year |  |  | 7,956 |  |  |  | (13,356 | ) |  |  | 5,741 |  |  |  | (7,615 | )
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount at the beginning of the year |  |  | 10,953 |  |  |  | (13,698 | ) |  |  | 5,622 |  |  |  | (8,076 | )
Additions |  |  | 1,171 |  |  |  | (2,341 | ) |  |  | 212 |  |  |  | (2,129 | )
Deductions |  |  | (835 | ) |  |  | 1,588 |  |  |  | (349 | ) |  |  | 1,239 |
Currency translation differences |  |  | (1,123 | ) |  |  | 862 |  |  |  | (202 | ) |  |  | 660 |
Other changes |  |  | 3 |  |  |  | (20 | ) |  |  | (21 | ) |  |  | (41 | )
Carrying amount at the end of the year |  |  | 10,169 |  |  |  | (13,609 | ) |  |  | 5,262 |  |  |  | (8,347 | )

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- Definition The disclosure of the reconciliation of changes in deferred tax liability assets. + References No definition available. + Details
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