Statement Of Changes In Equity [Abstract]

Sampo Oyj - Filing #5454473

Concept	As at 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	As at 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	2024-01-01 to 2024-12-31	As at 2024-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 2023-12-31	As at 2023-12-31	As at 2023-12-31	2023-01-01 to 2023-12-31	As at 2023-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31	As at 2022-12-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	4,000,000 EUR	—	—	— EUR	—	—	4 176 EUR	—	98,000,000 EUR	— EUR	746,000,000 EUR	—	—	7 059 EUR	—	3 527 EUR	—	—	— EUR	—	7 059 EUR	—	—	7 687 EUR	—	—	— EUR	6 378 EUR	—	—	1 527 EUR	—	—	424,000,000 EUR	—	98,000,000 EUR	742,000,000 EUR	7 263 EUR	1,000,000 EUR	—	4,000,000 EUR	4,000,000 EUR	0 EUR	4,000,000 EUR	10 178 EUR	— EUR	248,000,000 EUR	— EUR	— EUR	— EUR	— EUR	98,000,000 EUR	9 618 EUR	— EUR	560,000,000 EUR	248,000,000 EUR	— EUR	8 730 EUR	98,000,000 EUR	741,000,000 EUR	9 618 EUR	1 527 EUR	8 482 EUR	248,000,000 EUR	560,000,000 EUR	10 178 EUR	— EUR	— EUR	1 527 EUR	741,000,000 EUR	0 EUR
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	— EUR	— EUR	—	1 154 EUR	— EUR	—	— EUR	—	—	—	1 154 EUR	50,000,000 EUR	—	1 203 EUR	—	— EUR	— EUR	—	—	—	— EUR	1 393 EUR	—	— EUR	1 323 EUR	—	—	70,000,000 EUR	1 323 EUR	—	— EUR	— EUR	—	— EUR	—	—	—	—	— EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Other comprehensive income	—	— EUR	— EUR	—	3,000,000 EUR	— EUR	—	4,000,000 EUR	—	—	—	0 EUR	— EUR	—	3,000,000 EUR	—	— EUR	1,000,000 EUR	—	—	—	— EUR	8,000,000 EUR	—	— EUR	8,000,000 EUR	—	—	— EUR	5,000,000 EUR	—	— EUR	1,000,000 EUR	—	— EUR	—	—	—	—	1,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Comprehensive income	—	— EUR	— EUR	—	1 151 EUR	— EUR	—	4,000,000 EUR	—	—	—	1 153 EUR	50,000,000 EUR	—	1 200 EUR	—	— EUR	1,000,000 EUR	—	—	—	— EUR	1 386 EUR	—	— EUR	1 316 EUR	—	—	70,000,000 EUR	1 318 EUR	—	— EUR	1,000,000 EUR	—	— EUR	—	—	—	—	1,000,000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Issue of equity	—	— EUR	— EUR	—	2 000 EUR	— EUR	—	— EUR	—	—	—	— EUR	— EUR	—	2 000 EUR	—	—	— EUR	—	2 000 EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	— EUR	— EUR	—	903,000,000 EUR	— EUR	—	— EUR	—	—	—	903,000,000 EUR	69,000,000 EUR	—	972,000,000 EUR	—	— EUR	— EUR	—	—	—	— EUR	1 508 EUR	—	— EUR	1 321 EUR	—	—	187,000,000 EUR	1 321 EUR	—	— EUR	— EUR	—	— EUR	—	—	—	—	— EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through other changes, equity	—	— EUR	— EUR	—	14,000,000 EUR	— EUR	—	— EUR	—	—	—	14,000,000 EUR	11,000,000 EUR	—	25,000,000 EUR	—	— EUR	— EUR	—	—	—	— EUR	36,000,000 EUR	—	— EUR	51,000,000 EUR	—	—	15,000,000 EUR	51,000,000 EUR	—	— EUR	— EUR	—	— EUR	—	—	—	—	— EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity	—	— EUR	— EUR	—	1 666 EUR	— EUR	—	— EUR	—	—	—	1 666 EUR	334,000,000 EUR	—	2 000 EUR	—	— EUR	— EUR	—	—	—	— EUR	14,000,000 EUR	—	— EUR	11,000,000 EUR	—	—	3,000,000 EUR	11,000,000 EUR	—	— EUR	— EUR	—	— EUR	—	—	—	—	— EUR	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—