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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Cash and cash equivalents [abstract]    
Cash ₩ 8,449 ₩ 9,189
Demand deposits and checking accounts 2,193,991 2,220,202
Time deposits 1,994,158 1,908,284
Other cash equivalents 2,853,202 2,630,223
Cash and cash equivalents ₩ 7,049,800 ₩ 6,767,898