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Capital structure and financing - C.7.3. Equity investments (Details) - Equity Investment In HTA £ in Millions, shares in Millions, $ in Millions | 1 Months Ended | 12 Months Ended | 13 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 GBP (£) shares | Jun. 30, 2021 USD ($) shares | Dec. 31, 2020 GBP (£) shares | Dec. 31, 2020 USD ($) shares | Jul. 01, 2021 GBP (£) shares | Jul. 01, 2021 USD ($) shares
Disclosure of fair value measurement of assets [line items] |  |  |  |  |  |
Number of shares sold (in shares) | shares | 76 | 76 | 85 | 85 | 162 | 162
Proceeds from sales of investments accounted for using equity method | £ 115 | $ 163 | £ 130 | $ 169 | £ 244 | $ 383
Gain (loss) on disposal of equity method investment | $ |  | $ (15) |  | $ 6 |  |

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