Analysis Of Income And Expense [Abstract]

Direct Line Insurance Group PLC - Filing #2024748

Concept	2023-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2023-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31
Analysis of income and expense [abstract]
Material income and expense [abstract]
Gains (losses) on disposals of non-current assets [abstract]
Gains on disposals of non-current assets	443,900,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	— GBP	—	—	—	—	—	—	—
Investment income	178,600,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	115,400,000 GBP	—	—	—	—	—	—	—
Miscellaneous other operating expense	59,600,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	77,800,000 GBP	—	—	—	—	—	—	—
Expenses by nature [abstract]
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Impairment loss (reversal of impairment loss) recognised in profit or loss	700,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	600,000 GBP	—	—	—	—	—	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	—	— GBP	223,000,000 GBP	225,500,000 GBP	— GBP	200,000 GBP	2,700,000 GBP	— GBP	— GBP	— GBP	225,500,000 GBP	— GBP	— GBP	239,500,000 GBP	239,200,000 GBP	— GBP	— GBP	— GBP	600,000 GBP	239,500,000 GBP	300,000 GBP
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	225,500,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	239,500,000 GBP	—	—	—	—	—	—	—