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Capital and Funding - Summary of Comprehensive Income Reconciliation (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Analysis Of Fair Value Reserves Remeasurement Of Pensions And Currency Translation Reserve [Abstract]
1 January	€ 110	€ (123)
Gains/(losses) on equity instruments	68	25
Gains/(losses) on cash flow hedges	62	176
Hedging gains/(losses) transferred to non-financial assets	10	32
31 December	250	110	€ (123)
Remeasurement of defined benefit pension plans beginning balance	(1,146)	(1,499)
Movement during the year	215	353	(328)
Remeasurement of defined benefit pension plans ending balance	(931)	(1,146)	(1,499)
Currency retranslation gains/(losses) beginning balance	(5,084)	(5,069)
Other reserves	(2,356)	(18)
Retained profit	(22)	2
Non-controlling interest	(212)	1
Currency retranslation gains/(losses) ending balance	€ (7,674)	€ (5,084)	€ (5,069)

X

- Definition

The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)]

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A component of equity representing the reserve of gains and losses on financial assets measured at fair value through other comprehensive income. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

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Disclosure Of Analysis Of Fair Value Reserves Remeasurement Of Pensions And Currency Translation Reserve [Abstract]

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Other comprehensive income net of tax gains losses fom equity instruments attributable to shareholders equity.

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