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v3.26.1

Operating Segments - Revenue and Non-current Assets by Geographic Area (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of geographical areas [line items] |  |  |
Revenue | ₩ 68,986,938 | ₩ 73,459,408 | ₩ 77,056,549
Non-current assets | 49,477,974 | 46,577,548 |
Domestic [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Non-current assets | 34,594,834 | 33,512,812 |
Japan [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Non-current assets | 126,582 | 131,086 |
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Non-current assets | 1,074,438 | 1,140,136 |
Indonesia [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Non-current assets | 3,416,737 | 3,036,954 |
Asia-other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Non-current assets | 1,950,162 | 1,698,956 |
North America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Non-current assets | 2,400,911 | 1,857,787 |
Europe [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Non-current assets | 324,813 | 302,775 |
Other countries [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Non-current assets | 5,589,497 | 4,897,042 |
External customers [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | (107,948) | 771,265 | (70,648)
Reportable segments [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 117,240,806 | 125,013,953 | 127,080,006
Reportable segments [member] | External customers [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 69,094,886 | 72,688,143 | 77,127,197
Reportable segments [member] | External customers [member] | Domestic [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 42,516,707 | 45,960,140 | 50,658,510
Reportable segments [member] | External customers [member] | Japan [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 2,590,102 | 2,814,631 | 2,691,788
Reportable segments [member] | External customers [member] | China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 5,160,583 | 5,737,686 | 6,152,191
Reportable segments [member] | External customers [member] | Indonesia [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 2,873,999 | 3,156,962 | 3,422,647
Reportable segments [member] | External customers [member] | Asia-other [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 7,751,121 | 7,382,157 | 7,287,382
Reportable segments [member] | External customers [member] | North America [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 2,780,769 | 2,504,563 | 2,095,705
Reportable segments [member] | External customers [member] | Europe [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 3,065,738 | 2,743,528 | 2,468,508
Reportable segments [member] | External customers [member] | Other countries [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | ₩ 2,355,867 | ₩ 2,388,476 | ₩ 2,350,466

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