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Group assets and liabilities - measurement - Fair value disclosed (Details) - Assets and liabilities at amortised cost for which fair value is disclosed - GBP (£)
£ in Millions
Jun. 30, 2018
Dec. 31, 2017
Loans    
Financial instruments    
Financial assets, carrying value £ 12,139 £ 12,205
Financial assets, fair value 12,710 12,939
Investment contract liabilities without discretionary participation features held at fair value    
Financial instruments    
Financial liabilities, carrying value (3,001) (2,997)
Financial liabilities, fair value (3,003) (3,032)
Core structural borrowings of shareholder-financed operations    
Financial instruments    
Financial liabilities, carrying value (6,367) (6,280)
Financial liabilities, fair value (6,518) (7,032)
Operational borrowings attributable to shareholder-financed operations    
Financial instruments    
Financial liabilities, carrying value (1,618) (1,791)
Financial liabilities, fair value (1,618) (1,791)
Borrowings attributable to with-profits operations    
Financial instruments    
Financial liabilities, carrying value (1,843) (1,829)
Financial liabilities, fair value (1,768) (1,832)
Obligations under funding, securities lending and sale and repurchase agreements    
Financial instruments    
Financial liabilities, carrying value (7,128) (5,662)
Financial liabilities, fair value £ (7,126) £ (5,828)