GOODWILL (Details) - Narrative - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
GOODWILL (Details) - Narrative [Line Items]
Goodwill	£ 2,320	£ 2,324	£ 2,310
Scottish Widows
GOODWILL (Details) - Narrative [Line Items]
Goodwill	£ 1,836	£ 1,836
Percentage of entity goodwill (in percent)	79.00%	79.00%
Discount rate applied to cash flow projections (in percent)	10.00%
Growth rate used to extrapolate cash flow projections (in percent)	2.00%
MBNA Limited
GOODWILL (Details) - Narrative [Line Items]
Goodwill	£ 302	£ 302
Percentage of entity goodwill (in percent)	13.00%	13.00%
Motor Finance
GOODWILL (Details) - Narrative [Line Items]
Goodwill	£ 166	£ 170
Percentage of entity goodwill (in percent)	7.00%	7.00%
Discount rate applied to cash flow projections (in percent)	14.00%
Growth rate used to extrapolate cash flow projections (in percent)	0.50%
Cards
GOODWILL (Details) - Narrative [Line Items]
Discount rate applied to cash flow projections (in percent)	13.00%

The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

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The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

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