Statement Of Financial Position [Abstract]
| Concept |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Non-current assets [abstract] | |||||||||||||||
| Property, plant and equipment |
18,000,000
SEK
|
— | — | — | — |
21,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Non-current assets |
149,973,000,000
SEK
|
— | — | — | — |
128,914,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||
| Cash and cash equivalents |
697,000,000
SEK
|
— | — | — | — |
0
SEK
|
— | — | — | — | — |
56,000,000
SEK
|
— | — | — |
| Current assets |
779,000,000
SEK
|
— | — | — | — |
196,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Assets |
150,752,000,000
SEK
|
— | — | — | — |
129,110,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital |
1,088,000,000
SEK
|
— | — | — | — |
1,088,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Equity |
143,079,000,000
SEK
|
1,063,000,000
SEK
|
1,088,000,000
SEK
|
26,594,000,000
SEK
|
114,334,000,000
SEK
|
120,976,000,000
SEK
|
1,088,000,000
SEK
|
1,063,000,000
SEK
|
110,385,000,000
SEK
|
8,440,000,000
SEK
|
1,088,000,000
SEK
|
112,528,000,000
SEK
|
1,063,000,000
SEK
|
29,837,000,000
SEK
|
80,540,000,000
SEK
|
| Liabilities [abstract] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||
| Non-current provisions for employee benefits |
14,000,000
SEK
|
— | — | — | — |
42,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
164,000,000
SEK
|
— | — | — | — |
140,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Non-current liabilities |
5,785,000,000
SEK
|
— | — | — | — |
4,762,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||
| Current liabilities |
1,888,000,000
SEK
|
— | — | — | — |
3,372,000,000
SEK
|
— | — | — | — | — | — | — | — | — |
| Equity and liabilities |
150,752,000,000
SEK
|
— | — | — | — |
129,110,000,000
SEK
|
— | — | — | — | — | — | — | — | — |