Statement Of Comprehensive Income [Abstract]

M&G PLC - Filing #1586529

Concept	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31
Statement of comprehensive income [abstract]
Profit (loss)	9,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	83,000,000 GBP	92,000,000 GBP	83,000,000 GBP	1 ,1 3 8 GBP	– GBP	1 ,1 4 2 GBP	4,000,000 GBP	– GBP	1 ,1 3 8 GBP	– GBP	– GBP	– GBP
Other comprehensive income [abstract]
Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract]
Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans	—	—	—	—	—	—	—	71,000,000 GBP	—	—	—	11 7 GBP	—	—	—	—	—	—
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract]
Income tax relating to remeasurements of defined benefit plans included in other comprehensive income	—	—	—	—	—	—	—	1 9 GBP	—	—	—	23,000,000 GBP	—	—	—	—	—	—
Other comprehensive income	– GBP	– GBP	– GBP	– GBP	1 3 GBP	– GBP	37,000,000 GBP	37,000,000 GBP	50,000,000 GBP	81,000,000 GBP	– GBP	7 8 GBP	– GBP	– GBP	78,000,000 GBP	– GBP	3,000,000 GBP	– GBP
Comprehensive income	9,000,000 GBP	– GBP	– GBP	– GBP	1 3 GBP	– GBP	120,000,000 GBP	129,000,000 GBP	133,000,000 GBP	1,057,000,000 GBP	– GBP	1,06 4 GBP	4,000,000 GBP	– GBP	1,06 0 GBP	– GBP	3,000,000 GBP	– GBP
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	—	120,000,000 GBP	—	—	—	1,06 0 GBP	—	—	—	—	—	—
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	—	—	9,000,000 GBP	—	—	—	4,000,000 GBP	—	—	—	—	—	—