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Equity - Hybrid bond (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Hybrid Instrument [Line Items]    
Amount ₩ 4,749,837 ₩ 4,600,121
1st    
Hybrid Instrument [Line Items]    
Issue date Jun. 25, 2015 Jun. 25, 2015
Currency KRW KRW
Maturity date Jun. 25, 2045 Jun. 25, 2045
Interest rate (%) 4.38% 4.38%
Amount ₩ 0 ₩ 199,455
2nd    
Hybrid Instrument [Line Items]    
Issue date Sep. 15, 2017 Sep. 15, 2017
Interest rate (%) 4.25% 4.25%
Amount ₩ 89,783 ₩ 89,783
3rd    
Hybrid Instrument [Line Items]    
Issue date Apr. 13, 2018 Apr. 13, 2018
Interest rate (%) 4.56% 4.56%
Amount ₩ 14,955 ₩ 14,955
4th    
Hybrid Instrument [Line Items]    
Issue date Sep. 17, 2020 Sep. 17, 2020
Interest rate (%) 3.12% 3.12%
Amount   ₩ 448,699
5th    
Hybrid Instrument [Line Items]    
Issue date Mar. 16, 2021 Mar. 16, 2021
Interest rate (%) 2.94% 2.94%
Amount ₩ 429,009 ₩ 429,009
6th    
Hybrid Instrument [Line Items]    
Issue date Mar. 16, 2021 Mar. 16, 2021
Interest rate (%) 3.30% 3.30%
Amount ₩ 169,581 ₩ 169,581
7th    
Hybrid Instrument [Line Items]    
Issue date Jan. 25, 2022 Jan. 25, 2022
Interest rate (%) 3.90% 3.90%
Amount ₩ 560,438 ₩ 560,438
8th    
Hybrid Instrument [Line Items]    
Issue date Jan. 25, 2022 Jan. 25, 2022
Interest rate (%) 4.00% 4.00%
Amount ₩ 37,853 ₩ 37,853
9th    
Hybrid Instrument [Line Items]    
Issue date Aug. 26, 2022 Aug. 26, 2022
Interest rate (%) 4.93% 4.93%
Amount ₩ 343,026 ₩ 343,026
10th    
Hybrid Instrument [Line Items]    
Issue date Aug. 26, 2022 Aug. 26, 2022
Interest rate (%) 5.15% 5.15%
Amount ₩ 55,803 ₩ 55,803
11th    
Hybrid Instrument [Line Items]    
Issue date Jan. 30, 2023 Jan. 30, 2023
Interest rate (%) 5.14% 5.14%
Amount ₩ 398,831 ₩ 398,831
12th    
Hybrid Instrument [Line Items]    
Issue date Jul. 13, 2023 Jul. 13, 2023
Interest rate (%) 5.40% 5.40%
Amount ₩ 498,815 ₩ 498,815
13th    
Hybrid Instrument [Line Items]    
Issue date Jan. 31, 2024 Jan. 31, 2024
Interest rate (%) 4.49% 4.49%
Amount ₩ 398,833 ₩ 398,833
14th    
Hybrid Instrument [Line Items]    
Issue date Sep. 12, 2024 Sep. 12, 2024
Interest rate (%) 4.00% 4.00%
Amount ₩ 399,033 ₩ 399,033
15th    
Hybrid Instrument [Line Items]    
Issue date Feb. 13, 2025 Feb. 13, 2025
Interest rate (%) 3.90% 3.90%
Amount ₩ 398,835  
16th    
Hybrid Instrument [Line Items]    
Issue date Sep. 09, 2025 Sep. 09, 2025
Interest rate (%) 3.26% 3.26%
Amount ₩ 399,035  
17th    
Hybrid Instrument [Line Items]    
Issue date May 12, 2021 May 12, 2021
Currency USD USD
Interest rate (%) 2.88% 2.88%
Amount ₩ 556,007 ₩ 556,007