| Dec 31,
2014 | Dec 31,
2015 | Dec 31,
2016 | Dec 31,
2017 | Dec 31,
2018 | Dec 31,
2019 | Dec 31,
2020 |
|---|
| Cash and deposits | - | 1,225 | 2,250 | 7,402 | 3,164 | 2,709 | 2,187 |
|---|
| Trade accounts receivable | - | 91 | 72 | 44 | 59 | 86 | 173 |
|---|
| Operational investment securities | - | 943 | 1,217 | 2,373 | 6,973 | 9,275 | 9,133 |
|---|
| Operating loans | - | - | - | - | - | 430 | 647 |
|---|
| Short-term loans receivable from subsidiaries and associates | - | - | - | - | - | - | 293 |
|---|
| Advances paid | - | 33 | 13 | 16 | 27 | 109 | 73 |
|---|
| Other | - | 0 | 3 | 4 | 9 | 30 | 46 |
|---|
| Current assets | - | 2,349 | 3,705 | 9,960 | 10,306 | 12,674 | 12,600 |
|---|
| Buildings, net | - | 6 | 5 | 7 | 6 | 6 | 7 |
|---|
| Tools, furniture and fixtures, net | - | 2 | 3 | 4 | 5 | 5 | 6 |
|---|
| Property, plant and equipment | - | 8 | 8 | 11 | 11 | 11 | 13 |
|---|
| Software | - | 1 | 1 | 1 | 1 | 1 | 1 |
|---|
| Goodwill | - | - | - | - | 17 | 9 | 2 |
|---|
| Intangible assets | - | 1 | 1 | 1 | 1 | 1 | 1 |
|---|
| Investment securities | - | 60 | 60 | 14 | 9 | 9 | 9 |
|---|
| Leasehold and guarantee deposits | - | 40 | 38 | 44 | 43 | 41 | 45 |
|---|
| Deferred tax assets | - | - | - | - | - | 261 | 599 |
|---|
| Other | - | 1 | 1 | 1 | 1 | 0 | 21 |
|---|
| Investments and other assets | - | 353 | 352 | 517 | 674 | 751 | 1,125 |
|---|
| Non-current assets | - | 362 | 361 | 529 | 687 | 763 | 1,138 |
|---|
| Assets | - | 2,711 | 4,066 | 10,489 | 10,942 | 13,437 | 13,739 |
|---|
| Short-term borrowings | - | - | - | - | - | - | 293 |
|---|
| Current portion of long-term borrowings | - | - | - | - | - | 1,203 | 130 |
|---|
| Accounts payable - other | - | 3 | 2 | 345 | 193 | 227 | 159 |
|---|
| Accrued expenses | - | 106 | 203 | 227 | 225 | 117 | 130 |
|---|
| Accrued consumption taxes | - | - | 11 | 161 | 0 | 19 | - |
|---|
| Income taxes payable | - | 92 | 56 | 565 | 235 | 276 | 189 |
|---|
| Other | - | - | 3 | 5 | 10 | 48 | 42 |
|---|
| Current liabilities | - | 202 | 298 | 1,521 | 688 | 1,855 | 910 |
|---|
| Long-term borrowings | - | - | - | 723 | 715 | - | 874 |
|---|
| Provision for retirement benefits for directors (and other officers) | - | 78 | 90 | 101 | 105 | 105 | 103 |
|---|
| Provision for directors' retirement benefits-stockBS | - | - | - | - | 37 | 87 | 137 |
|---|
| Employee provision for retirement benefits-stockBS | - | - | - | - | - | 4 | 11 |
|---|
| Retirement benefit liability | - | 36 | 48 | 64 | 75 | 87 | 117 |
|---|
| Long-term accounts payable - other | - | - | - | 32 | 233 | 349 | 292 |
|---|
| Long-term deposits received | - | - | 12 | 12 | 12 | 12 | 12 |
|---|
| Other | - | - | - | - | - | 78 | 40 |
|---|
| Non-current liabilities | - | 114 | 149 | 209 | 462 | 644 | 1,546 |
|---|
| Liabilities | - | 316 | 447 | 1,729 | 1,150 | 2,499 | 2,456 |
|---|
| Share capital | - | 429 | 876 | 2,962 | 2,998 | 3,020 | 3,026 |
|---|
| Capital surplus | - | 399 | 846 | 2,932 | 2,968 | 2,990 | 2,996 |
|---|
| Retained earnings | - | 1,512 | 1,828 | 2,816 | 3,832 | 5,257 | 6,210 |
|---|
| Treasury shares | - | - | -0 | -0 | -150 | -299 | -597 |
|---|
| Shareholders' equity | - | 2,340 | 3,549 | 8,710 | 9,648 | 10,968 | 11,635 |
|---|
| Valuation difference on available-for-sale securities | - | 54 | 68 | 49 | 143 | -32 | -353 |
|---|
| Foreign currency translation adjustment | - | 28 | -16 | -65 | -154 | -198 | -201 |
|---|
| Valuation and translation adjustments | - | 54 | 68 | 49 | 143 | -32 | -353 |
|---|
| Share acquisition rights | - | 1 | 1 | 1 | 1 | 1 | 0 |
|---|
| Non-controlling interests | - | 95 | 128 | 158 | 658 | 577 | 560 |
|---|
| Net assets | 1,477 | 2,395 | 3,619 | 8,760 | 9,792 | 10,937 | 11,283 |
|---|
| Liabilities and net assets | - | 2,711 | 4,066 | 10,489 | 10,942 | 13,437 | 13,739 |
|---|