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Capital structure and financing - C.7.3. Equity investments (Details) £ / shares in Units, $ / shares in Units, £ in Millions, shares in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Oct. 17, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jan. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 GBP (£) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 £ / shares | Oct. 31, 2019 USD ($) | Oct. 31, 2019 £ / shares | Oct. 17, 2019 £ / shares | Apr. 11, 2019 $ / shares
Disclosure of fair value measurement of assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments accounted for using equity method |  |  |  |  | $ 160 |  | $ 371 |  |  |  |  |  |
Equity Investment In Jumia |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net dilution gain (loss) |  |  |  | $ 7 |  |  |  |  |  |  |  |  |
Offer price per share (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.5
Gain on investment |  | $ 30 |  |  |  |  |  |  |  |  |  |  |
Percentage ownership held by non-controlling interest |  | 6.31% |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  | $ 29 |  |  |  |  |  |  |  |  |  |
Gain on disposal of equity method investment |  |  | $ 15 |  |  |  |  |  |  |  |  |  |
Investments accounted for using equity method |  |  |  |  | 0 |  | 32 |  |  |  |  |  |
Change in fair value in investment |  |  |  |  | $ (18) |  | $ (38) | $ 0 |  |  |  |  |
Equity Investment In HTA |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net dilution gain (loss) | $ (3) |  |  |  |  |  |  |  |  |  |  |  |
Offer price per share (usd per share) | £ / shares |  |  |  |  |  |  |  |  |  |  | £ 1.15 | £ 1.15 |
Gain on investment | 208 |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership held by non-controlling interest |  |  |  |  | 7.60% | 7.60% | 16.20% |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  |  |  |  | $ 169 | £ 130 |  |  |  |  |  |  |
Gain on disposal of equity method investment |  |  |  |  | 6 |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |
Investments accounted for using equity method | $ 292 |  |  |  | 160 |  | $ 338 |  |  |  |  |  |
Change in fair value in investment |  |  |  |  | $ (16) |  | $ 312 | $ 0 |  |  |  |  |
Market capitalization |  |  |  |  |  |  |  |  |  | $ 1,450 |  |  |
IPO option rights (as a percentage) | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Disposal of proportion of ownership interest (as a percentage) | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from disposal | $ 57 |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from disposal | 25 |  |  |  |  |  |  |  |  |  |  |  |
Share in tax escrow | 30 |  |  |  |  |  |  |  |  |  |  |  |
Loss on disposal | $ 32 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold (in shares) | shares |  |  |  |  | 85 | 85 |  |  |  |  |  |  |
Closing price (in dollars per share) | £ / shares |  |  |  |  |  |  |  |  | £ 1.53 |  |  |  |

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