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Dividends - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 29, 2019 USD ($) | Jan. 14, 2019 £ / shares shares | May 22, 2017 USD ($) | May 23, 2016 USD ($) | Oct. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | May 08, 2017 £ / shares shares | May 09, 2016 £ / shares shares
Disclosure of dividends paid and proposed [line items] |  |  |  |  |  |  |  |  |  |
Final Proposed (not recognised as a liability at 31 December) | $ / shares |  |  |  |  |  | $ 0.781 | $ 0.710 | $ 0.640 |  |
Announced return of funds to shareholders by way of special dividend | $ |  |  | $ 400 | $ 1,500 | $ 500 | $ 0 | $ 404 | $ 1,500 |  |
Special dividend per share | $ / shares |  |  |  |  | $ 2.621 | $ 0.000 | $ 2.025 | $ 6.329 |  |
Share consolidation basis - number of new ordinary shares |  |  |  |  |  |  |  |  | 45 | 5
Share consolidation basis - nominal value per share of existing ordinary shares | £ / shares |  |  |  |  |  |  |  |  | £ 0.19810 | £ 0.18967
Share consolidation basis - number of existing ordinary shares |  |  |  |  |  |  |  |  | 47 | 6
Share consolidation basis - nominal value per share of existing ordinary shares | £ / shares |  |  |  |  |  |  |  |  | £ 0.18967 | £ 0.15805
Share capital consolidation |  |  |  |  |  |  | 9,000,000 | 42,000,000 |  |
Proposed dividends [member] |  |  |  |  |  |  |  |  |  |
Disclosure of dividends paid and proposed [line items] |  |  |  |  |  |  |  |  |  |
Final Proposed (not recognised as a liability at 31 December) | $ / shares |  |  |  |  |  | $ 0.781 |  |  |  |
Final Proposed (not recognised as a liability at 31 December) dividend approval date |  |  |  |  |  | May 03, 2019 |  |  |  |
Final proposed dividend record date |  |  |  |  |  | Mar. 29, 2019 |  |  |  |
Announced return of funds to shareholders by way of special dividend | $ | $ 510 |  |  |  |  |  |  |  |  |
Share consolidation basis - number of new ordinary shares |  | 19 |  |  |  |  |  |  |  |
Share consolidation basis - nominal value per share of existing ordinary shares | £ / shares |  | £ 0.2085 |  |  |  |  |  |  |  |
Share consolidation basis - number of existing ordinary shares |  | 20 |  |  |  |  |  |  |  |
Share consolidation basis - nominal value per share of existing ordinary shares | £ / shares |  | £ 0.19810 |  |  |  |  |  |  |  |
Share capital consolidation |  | 10,000,000 |  |  |  |  |  |  |  |

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- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_137_a&doctype=Standard -URIDate 2018-03-16 + Details
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