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Analysis of cash flows - Summary of Analysis of Cash Flows (Parenthetical) (Detail) - Jun. 30, 2020 | GBP (£) | USD ($) | EUR (€)
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Disclosure Of Cash Flow Statement [line items] |  |  |
Bond amount | £ | £ 7,435,500,000 |  |
Repayment of EURO 250 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |
Bond amount | € |  |  | € 250,000,000
Repayment of GBP 200 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |
Bond amount | £ | 200,000,000 |  |
Partial repayment of USD 450 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |
Bond amount | $ |  | $ 450,000,000 |
Partial repayment of USD 272 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |
Bond amount | $ |  | 272,000,000 |
Repayment of EURO 600 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |
Bond amount | € |  |  | 600,000,000
Repayment of USD 812 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |
Bond amount | $ |  | $ 812,000,000 |
Proceeds from issue of EURO 750 million bonds [member] |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |
Bond amount | € |  |  | € 750,000,000
Proceeds from issue of GBP 250 million bonds [Member] |  |  |
Disclosure Of Cash Flow Statement [line items] |  |  |
Bond amount | £ | £ 250,000,000 |  |

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