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Financial Risk Management - Summary of Cash, Cash Equivalents and Interest-Bearing Securities (Detail) - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | kr 26,975 | kr 35,316
Other financial institutions | 202 | 294
Derivative assets | 1,510 | 142
Cash, cash equivalents, interest bearing securities and derivative assets | 73,555 | 72,334
Banks |  | 654
Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 26,829 | 35,006
Other financial institutions | 202 | 294
Derivative assets | 189 | 4
Cash, cash equivalents, interest bearing securities and derivative assets | 44,396 | 45,846
Banks |  | 441
Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 130 | 309
Other financial institutions | 0 | 0
Derivative assets | 346 | 3
Cash, cash equivalents, interest bearing securities and derivative assets | 5,050 | 5,997
Banks |  | 213
Maturity less than five years [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 16 | 1
Other financial institutions | 0 | 0
Derivative assets | 975 | 135
Cash, cash equivalents, interest bearing securities and derivative assets | 23,714 | 19,585
2026 and later [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 0 | 0
Other financial institutions | 0 | 0
Derivative assets | 0 | 0
Cash, cash equivalents, interest bearing securities and derivative assets | 395 | 906
AAA [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 28,483 | 14,885
Mortgage institutes | 14,425 | 15,198
AAA [member] | Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 15,000 | 4,028
Mortgage institutes | 216 | 278
AAA [member] | Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 605 | 1,590
Mortgage institutes | 3,969 | 3,832
AAA [member] | Maturity less than five years [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 12,483 | 8,361
Mortgage institutes | 10,240 | 11,088
AAA [member] | 2026 and later [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 395 | 906
Mortgage institutes | 0 | 0
A2/P2 [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 1,960 | 5,305
A2/P2 [member] | Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 1,960 | 5,305
A2/P2 [member] | Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 0 | 0
A2/P2 [member] | Maturity less than five years [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 0 | 0
A2/P2 [member] | 2026 and later [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | kr 0 | 0
A2 [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Other financial institutions |  | 540
A2 [member] | Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Other financial institutions |  | 490
A2 [member] | Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Other financial institutions |  | 50
A2 [member] | Maturity less than five years [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Other financial institutions |  | 0
A2 [member] | 2026 and later [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Other financial institutions |  | kr 0

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- Definition The amount of bank balances held at central banks other than mandatory reserve deposits. [Refer: Mandatory reserve deposits at central banks] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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