Contract Assets and Liabilities - Summary of Contract Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of revenue from contracts with customers [line items] | ||
| Contract assets | ₩ 188,609 | ₩ 136,737 |
| Contract liabilities | 401,943 | 229,706 |
| Wireless service contracts [member] | ||
| Disclosure of revenue from contracts with customers [line items] | ||
| Contract liabilities | 21,807 | 20,275 |
| Customer loyalty programs [member] | ||
| Disclosure of revenue from contracts with customers [line items] | ||
| Contract liabilities | 5,920 | 5,694 |
| Fixed-line service contracts [member] | ||
| Disclosure of revenue from contracts with customers [line items] | ||
| Contract liabilities | 288,421 | 151,427 |
| Other contract liabilities [member] | ||
| Disclosure of revenue from contracts with customers [line items] | ||
| Contract liabilities | ₩ 85,795 | ₩ 52,310 |