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Post-Employment Benefits - Summary of Asset Allocation by Asset Type and Geography (Detail) - SEK (kr) kr in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 1,266 | kr 1,872
Equity securities | 10,314 | 11,126
Debt securities | 32,892 | 32,117
Real estate | 6,005 | 6,379
Investment funds | 7,025 | 4,701
Assets held by insurance company | 4,116 | 3,589
Other | 975 | 696
Fair value of plan assets | kr 62,593 | kr 60,480
Investment funds [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Investment funds (percentage) | 69.00% | 74.00%
Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents (percentage) | 22.00% | 6.00%
Equity securities [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities (percentage) | 27.00% | 50.00%
Debt securities [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities (percentage) | 21.00% | 28.00%
Real estate [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 100.00% | 100.00%
Assets held by insurance company [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 100.00% | 100.00%
Other [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Other (percentage) | 38.00% | 15.00%
Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%
Sweden [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 271 | kr 1,151
Equity securities | 7,311 | 6,803
Debt securities | 14,335 | 14,114
Real estate | 5,461 | 5,577
Investment funds | 2,016 | 917
Assets held by insurance company | 0 | 0
Other | 233 | (41)
Fair value of plan assets | kr 29,627 | kr 28,521
Sweden [member] | Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
Sweden [member] | Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%
US [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 181 | kr 184
Equity securities | 361 | 419
Debt securities | 3,591 | 3,646
Real estate | 0 | 0
Investment funds | 834 | 789
Assets held by insurance company | 0 | 0
Other | (152) | 73
Fair value of plan assets | kr 4,815 | kr 5,111
US [member] | Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
US [member] | Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%
United Kingdom [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 681 | kr 449
Equity securities | 769 | 1,113
Debt securities | 5,681 | 5,818
Real estate | 0 | 199
Investment funds | 2,346 | 2,417
Assets held by insurance company | 2,437 | 1,872
Other | 496 | 131
Fair value of plan assets | kr 12,410 | kr 11,999
United Kingdom [member] | Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
United Kingdom [member] | Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%
Other Countries [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 133 | kr 88
Equity securities | 1,873 | 2,791
Debt securities | 9,285 | 8,539
Real estate | 544 | 603
Investment funds | 1,829 | 578
Assets held by insurance company | 1,679 | 1,717
Other | 398 | 533
Fair value of plan assets | kr 15,741 | kr 14,849
Other Countries [member] | Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
Other Countries [member] | Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%

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