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Post-Employment Benefits - Summary of Asset Allocation by Asset Type and Geography (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 2,637 | kr 3,727
Equity securities | 11,994 | 10,347
Debt securities | 46,857 | 44,787
Real estate | 5,021 | 5,208
Investment funds | 4,341 | 3,047
Assets held by insurance company | 1,409 | 1,404
Other | 1,352 | 1,139
Fair value of plan assets | kr 73,611 | kr 69,659
Investment funds [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 50.00% | 65.00%
Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 0.00% | 0.00%
Equity securities [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 18.00% | 15.00%
Debt securities [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 7.00% | 7.00%
Real estate [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 100.00% | 100.00%
Assets held by insurance company [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 100.00% | 100.00%
Other [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 0.00% | 6.00%
Sweden [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 1,117 | kr 1,319
Equity securities | 5,635 | 3,784
Debt securities | 13,570 | 11,969
Real estate | 4,338 | 4,489
Investment funds | 2,153 | 1,248
Other | 154 |
Fair value of plan assets | 26,967 | 22,809
US [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | 575 | 1,013
Equity securities | 655 | 773
Debt securities | 14,557 | 17,050
Investment funds | 1,495 | 1,261
Other | 45 | 5
Fair value of plan assets | 17,327 | 20,102
United Kingdom [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | 911 | 1,309
Equity securities | 3,469 | 3,368
Debt securities | 11,745 | 10,994
Real estate | 152 | 169
Investment funds | 274 | 296
Other | 775 | 783
Fair value of plan assets | 17,326 | 16,919
Other Countries [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | 34 | 86
Equity securities | 2,235 | 2,422
Debt securities | 6,985 | 4,774
Real estate | 531 | 550
Investment funds | 419 | 242
Assets held by insurance company | 1,409 | 1,404
Other | 378 | 351
Fair value of plan assets | kr 11,991 | kr 9,829

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