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Remuneration of Auditors - Summary of Services from Auditors and its Associates (Parenthetical) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees € 19 € 17 € 16
Amount paid in relation to each type of non-statutory audit services [1] 0 0 0
Work on simplification [member]      
Disclosure of Auditors Remuneration [Line Items]      
Assurance work on simplification 1   1
Review of tea carve out accounts [member]      
Disclosure of Auditors Remuneration [Line Items]      
Auditor remuneration for audits and reviews of spreads carve out financial statements 6    
Review of spreads carve-out accounts [member]      
Disclosure of Auditors Remuneration [Line Items]      
Auditor remuneration for audits and reviews of spreads carve out financial statements     4
Top of range [member]      
Disclosure of Auditors Remuneration [Line Items]      
Services supplied to associated pension schemes 1 1 1
Amount paid in relation to each type of non-statutory audit services 1 1 1
KPMG Accountants N.V. [member]      
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees 0 1 1
KPMG LLP [member]      
Disclosure of Auditors Remuneration [Line Items]      
Total statutory audit fees € 6 € 4 € 5
[1] Amounts paid in relation to each type of service are less than €1 million individually and in aggregate (2019: less than €1 million and in aggregate; 2018: less than €1 million).