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Unsecured senior notes (Details) ¥ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2016 CNY (¥) item | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Jan. 31, 2020 CNY (¥) | Jan. 31, 2020 USD ($) | Apr. 30, 2016 USD ($)
Unsecured senior notes |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | ¥ 8,300 |  |  |  |  |  |  |  |  |  |
Carrying value |  | 10,411 | ¥ 10,224 |  |  | $ 1,466 |  |  |  |  |  |
Total principal amounts of unsecured senior notes |  | 47,000 |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  |  |  |  |  |  |  |  |  |
Number of maturities for debt issued | item | 2 |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ |  |  |  |  |  |  | $ 500 |  |  |  | $ 1,000 | $ 1,000
Carrying value |  | 10,411 | 10,224 |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  | 86 | 98 |  |  |  |  |  |  |  |  |
Total principal amounts of unsecured senior notes |  | 10,497 | 10,322 |  |  |  |  |  |  |  |  |
Debt discount | ¥ 79 |  |  |  |  |  |  |  |  | ¥ 37 |  |
Debt issuance costs | ¥ 36 |  |  |  |  |  |  |  |  | ¥ 45 |  |
Future principal payments for unsecured senior notes due |  |  |  |  |  |  |  |  |  |  |  |
Due in 2026 |  | 3,541 |  |  |  |  |  |  |  |  |  |
Due in 2030 |  | 4,922 |  |  |  |  |  |  |  |  |  |
Due in 2050 |  | ¥ 2,034 |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  | Apr. 29, 2021 |  |  |  |  |  |  |  |  |  |
Unsecured senior notes | 3.875% notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 500
Interest rate (as a percent) | 3.875% |  |  |  |  |  |  |  |  |  |  | 3.875%
Carrying value |  | ¥ 3,520 | 3,453 |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  | 4.15% |  |  |  | 4.15% |  |  |  |  |  |
Unsecured senior notes | 3.375% notes due 2030 |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 700
Interest rate (as a percent) | 3.375% |  |  |  |  |  |  |  |  |  |  | 3.375%
Carrying value |  | ¥ 4,898 | 4,812 |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  | 3.47% |  |  |  | 3.47% |  |  |  |  |  |
Unsecured senior notes | 4.125% notes due 2050 |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 300
Interest rate (as a percent) | 4.125% |  |  |  |  |  |  |  |  |  |  | 4.125%
Carrying value |  | ¥ 1,993 | 1,959 |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  | 4.25% |  |  |  | 4.25% |  |  |  |  |  |
Unsecured senior notes | Unsecured Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Future principal payments for unsecured senior notes due |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument repurchase amount |  | ¥ 42 |  |  |  | $ 6 |  | ¥ 78 | $ 12 |  |  |
Take as Extension |  | ¥ 35 |  |  |  | $ 5 |  | ¥ 72 | $ 10 |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Future principal payments for unsecured senior notes due |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ |  |  |  | $ 500 |  |  |  |  |  |  |  |
Interest Expense [Member] | Unsecured senior notes | Unsecured Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Future principal payments for unsecured senior notes due |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Repurchased Gain |  |  | ¥ 6 |  | ¥ 11 |  |  |  |  |  |  |

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