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Capital and Funding - Summary of Comprehensive Income: Other Comprehensive Income Reconciliation (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of analysis of other comprehensive income by item [abstract] |  |  |  |
Fair value gains/(losses) beginning balance |  | € (189) | € (113) |
Equity instruments | [1] | 51 |  |
Cash flow hedges |  | (55) | (68) |
Available for sale financial assets |  |  | (8) |
Fair value gains/(losses) ending balance |  | (194) | (189) | € (113)
Remeasurement of defined benefit pension plans beginning balance |  | (1,171) | (2,453) |
Movement during the year |  | (328) | 1,282 | (980)
Remeasurement of defined benefit pension plans ending balance |  | (1,499) | (1,171) | (2,453)
Currency retranslation gains/(losses) beginning balance |  | (4,278) | (3,295) |
Other reserves |  | (836) | (903) |
Retained profit |  | (10) | (27) |
Non-controlling interest |  | (15) | (53) |
Currency retranslation gains/(losses) ending balance |  | € (5,139) | € (4,278) | € (3,295)
[1] | Classification in 2018 has changed following adoption of IFRS 9. See note 1 for further details.

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