| Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income | - | - | - | 175 | 307 | 416 | 460 | 522 | 336 | 265 | 271 | 222 |
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| Depreciation | 4 | 6 | 8 | 9 | 13 | 13 | 15 | 24 | 35 | 33 | 24 | 17 |
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| Amortization of intangible assets | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 13 | 11 | 11 | 10 |
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| Amortization of operating lease assets | - | - | - | - | - | - | - | - | 19 | 17 | 15 | 15 |
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| Gain on disposal of property and equipment | -0 | -0 | -0 | -0 | -0 | -0 | -0 | 0 | 0 | 0 | 0 | 0 |
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| Provision for credit losses | - | - | - | - | - | - | - | - | - | - | - | 5 |
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| Share of results of equity method investments | - | - | 0 | -1 | -2 | 4 | 0 | -0 | 0 | -7 | 4 | -15 |
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| Impairment of long-term investments | - | - | - | - | - | - | - | - | - | 0 | - | - |
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| Fair value change of short-term investments | - | - | - | - | - | 4 | -3 | -1 | -17 | -17 | 4 | 6 |
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| Share-based compensation | 4 | 9 | 17 | 28 | 27 | 29 | 29 | 32 | 32 | 24 | 27 | 26 |
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| Deferred income taxes | - | - | - | -15 | 2 | 15 | 21 | -3 | -24 | -22 | -7 | -6 |
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| Accounts receivable | 23 | 44 | 53 | 19 | 106 | 132 | 69 | 6 | -146 | -30 | -68 | -11 |
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| Amounts due from related parties, current | - | - | 0 | 3 | 1 | 1 | -1 | 3 | 6 | -5 | -5 | 7 |
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| Prepaid expenses and other current assets | 0 | 10 | 41 | 11 | -29 | 9 | 7 | 33 | -0 | 22 | 34 | 8 |
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| Amounts due from related parties, non-current | - | - | - | 0 | 2 | -1 | 0 | 2 | -2 | 0 | 1 | -2 |
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| Other non-current assets | 1 | 2 | 0 | 2 | -3 | 1 | 27 | 39 | -0 | 15 | 27 | 5 |
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| Accrued expenses and other payables | 16 | 32 | 49 | 44 | 65 | 117 | -3 | -24 | -68 | 77 | 52 | -18 |
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| Advance from customers | - | - | - | - | - | 1 | 3 | 5 | -1 | -4 | 1 | 0 |
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| Deferred revenue | - | 36 | 67 | 20 | 61 | 15 | -20 | -8 | 37 | -59 | -49 | -72 |
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| Income tax payable | -1 | 9 | 23 | 5 | -26 | -4 | -11 | 6 | 23 | 3 | -3 | -6 |
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| Amounts due to related parties | 0 | -0 | 4 | -1 | -1 | 1 | 2 | 7 | -8 | -1 | -0 | 2 |
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| Other liabilities | 2 | -1 | 1 | 0 | -0 | -1 | 3 | 7 | -12 | 3 | 5 | -9 |
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| Net cash generated from operating activities | 98 | 165 | - | - | - | 453 | 415 | 510 | 553 | 372 | 345 | 188 |
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| Purchase of property and equipment | 7 | 7 | 14 | 13 | 13 | 17 | 29 | 40 | 34 | 17 | 11 | 19 |
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| Proceeds from disposal of property and equipment | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
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| Purchase of intangible assets | 0 | 0 | - | - | 3 | 0 | - | 0 | 0 | 0 | 0 | - |
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| Acquisition of equity-method investment | - | - | - | - | - | - | - | - | - | 58 | - | - |
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| Purchase of short-term investments | - | 347 | 574 | 607 | 3,015 | 7,931 | 6,128 | 6,138 | 4,250 | 2,747 | 2,467 | 2,885 |
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| Maturity of short-term investments | - | 71 | 543 | 548 | 2,272 | 7,554 | 5,989 | 5,819 | 3,698 | 2,371 | 2,618 | 2,485 |
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| Net cash (used in)/generated from investing activities | -8 | -284 | - | - | - | -480 | -168 | -458 | -598 | -451 | 141 | -418 |
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| Proceeds from Stock Options Exercised | - | 6 | 5 | 4 | 9 | 8 | 10 | 16 | 6 | 0 | 0 | 0 |
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| Payment of dividends | 36 | - | - | - | - | 87 | - | 100 | 106 | 61 | 69 | 203 |
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| Payments for repurchase of ordinary shares | 38 | 37 | - | - | - | - | - | - | 5 | 104 | 89 | 31 |
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| Net cash used in financing activities | 28 | 104 | - | - | - | -79 | 10 | -84 | 455 | -165 | -158 | -233 |
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| Effect of exchange rate changes on cash and cash equivalents and restricted cash | - | - | - | - | - | 6 | -2 | -3 | -7 | 24 | -2 | 5 |
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| Net (decrease)/increase in cash and cash equivalents and restricted cash | - | - | - | - | - | - | 255 | -34 | 402 | -220 | 326 | -458 |
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| Income taxes paid | 18 | 22 | 21 | 15 | 66 | 53 | 62 | 86 | 53 | 41 | 28 | 23 |
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| Capital Expenditures Incurred but Not yet Paid | - | 2 | 0 | 2 | 1 | 4 | 3 | 5 | 3 | 1 | 5 | 3 |
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| Dividends Declared Not Paid | - | - | - | - | 92 | - | - | - | - | - | 139 | 136 |
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| Cash paid for operating lease cost | - | - | - | - | - | - | 19 | 21 | 22 | 18 | 16 | 15 |
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| Right-of-use assets acquired under operating leases | - | - | - | - | - | - | 8 | 33 | 6 | 16 | 27 | 2 |
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