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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, 2021 | Dec. 31, 2020
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 3,114 | kr 2,637
Equity securities | 14,752 | 11,994
Debt securities | 50,948 | 48,857
Real estate | 5,946 | 5,021
Investment funds | 3,513 | 4,341
Assets held by insurance company | 1,597 | 1,409
Other | 1,485 | 1,352
Fair value of plan assets | kr 81,355 | kr 73,611
Investment funds [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 64.00% | 74.00%
Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 33.00% | 45.00%
Equity securities [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 58.00% | 58.00%
Debt securities [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Percentage Of plan assets allocation of which unquoted | 44.00% | 45.00%
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 | 69.00% | 72.00%
Sweden [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 1,100 | kr 1,117
Equity securities | 7,619 | 5,635
Debt securities | 14,427 | 13,570
Real estate | 5,157 | 4,338
Investment funds | 1,782 | 2,153
Other | (209) | 154
Fair value of plan assets | 29,876 | 26,967
US [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | 500 | 575
Equity securities | 659 | 655
Debt securities | 15,817 | 14,557
Investment funds | 1,247 | 1,495
Other | 31 | 45
Fair value of plan assets | 18,254 | 17,327
United Kingdom [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | 1,468 | 911
Equity securities | 3,823 | 3,469
Debt securities | 12,705 | 11,745
Real estate | 195 | 152
Investment funds |  | 274
Other | 1,236 | 775
Fair value of plan assets | 19,427 | 17,326
Other Countries [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | 46 | 34
Equity securities | 2,651 | 2,235
Debt securities | 7,999 | 6,985
Real estate | 594 | 531
Investment funds | 484 | 419
Assets held by insurance company | 1,597 | 1,409
Other | 427 | 378
Fair value of plan assets | kr 13,798 | kr 11,991

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