v3.25.4
Impairments - Loan credit quality (Details) - SEK (kr)
kr in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses kr 341,277 kr 359,484
AA+ to A-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 80,079 85,056
BBB+ to BBB-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 79,903 75,529
CCC to D    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 2,481 919
Gross carrying amount | Loans    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 263,517 283,931
Gross carrying amount | Loans | AA+ to A-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 45,539 40,548
Gross carrying amount | Loans | BBB+ to BBB-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 122,962 141,698
Gross carrying amount | Loans | BB+ to BB-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 64,823 72,476
Gross carrying amount | Loans | B+ to B-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 18,874 18,990
Gross carrying amount | Loans | CCC to D    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 11,319 10,219
Gross carrying amount | Stage 1 | Loans    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 222,137 245,998
Gross carrying amount | Stage 1 | Loans | AA+ to A-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 45,539 40,548
Gross carrying amount | Stage 1 | Loans | BBB+ to BBB-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 121,602 141,632
Gross carrying amount | Stage 1 | Loans | BB+ to BB-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 37,308 45,239
Gross carrying amount | Stage 1 | Loans | B+ to B-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 17,354 18,437
Gross carrying amount | Stage 1 | Loans | CCC to D    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 334 142
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Loans    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 35,421 30,678
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Loans | BBB+ to BBB-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 1,361 66
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Loans | BB+ to BB-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 27,515 27,237
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Loans | B+ to B-    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 1,521 553
Gross carrying amount | Lifetime expected credit losses | Stage 2 | Loans | CCC to D    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 5,024 2,822
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses 5,960 7,255
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans | CCC to D    
Disclosure of credit risk exposure [line items]    
Total, before expected credit losses kr 5,960 kr 7,255