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IFRSs not yet adopted (Details Textual) € in Millions | 12 Months Ended
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Dec. 31, 2017 EUR (€)
DisclosureOfIfrssNotYetAdoptedLineItems [Line Items] |
Customer acquisition costs capitalized | € 60
Expected credit loss model [Member] |
DisclosureOfIfrssNotYetAdoptedLineItems [Line Items] |
ImpairmentLoss | € 356
Intragroup related balances [Member] |
DisclosureOfIfrssNotYetAdoptedLineItems [Line Items] |
Description Of How Future Recovery Or Reversal Of Regulatory Deferral Account Balances is Affected By Risks And Uncertainty | For exposures arising from intragroup transactions, the recovery rate is assumed to be 100% in consideration of the possibility of providing for capital contribution to the investees in order to guarantee their solvency.
Increase Decrease Due To Application Of IFRS15 [Member] |
DisclosureOfIfrssNotYetAdoptedLineItems [Line Items] |
Decrease in equity | € 43
Increase Decrease Due To Application Of IFRS15 [Member] | Sales method [Member] |
DisclosureOfIfrssNotYetAdoptedLineItems [Line Items] |
Decrease in equity | 103
Increase decrease due to application of ifrs 9 [Member] |
DisclosureOfIfrssNotYetAdoptedLineItems [Line Items] |
Increase in equity | 322
IncreaseDecreaseInFairValueMeasurementEntitysOwnEquityInstruments | € 678

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- Definition The amount of customer acquisition costs capitalized during the year. + References No definition available. + Details
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Balance Type: | debit
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- Definition The amount of decrease in equity due to effect of adoption of ifrs. + References No definition available. + Details
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- Definition The amount of increase in equity due to effect of adoption of ifrs. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The description of how the future recovery or reversal of regulatory deferral account balances is affected by risks and uncertainty. [Refer: Regulatory deferral account balances [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 14 -IssueDate 2017-01-01 -Paragraph 30 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=14&date=2017-03-01&anchor=para_30_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The increase (decrease) in the fair value measurement of the entity's own equity instruments. [Refer: At fair value [member]; Entity's own equity instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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