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Analysis of cash flows - Summary of Analysis of Cash Flows (Parenthetical) (Detail) - Jun. 30, 2018 | GBP (£) | USD ($) | EUR (€)
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Disclosure Of Cash Flow Statement [Line Items] |  |  |
Bond amount | £ | £ 8,208,800,000 |  |
Proceeds from issue of EURO 250 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [Line Items] |  |  |
Bond amount |  |  | € 250,000,000
Proceeds from issue of EURO 500 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [Line Items] |  |  |
Bond amount |  |  | 500,000,000
Partial repayment of USD 300 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [Line Items] |  |  |
Bond amount | $ |  | $ 300,000,000 |
Repayment of EURO 252 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [Line Items] |  |  |
Bond amount |  |  | € 252,000,000
Repayment of GBP 400 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [Line Items] |  |  |
Bond amount | £ | £ 400,000,000 |  |

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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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