Post-retirement defined benefit schemes (Details) - GBP (£) £ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017
Defined benefit pension schemes:
Fair value of scheme assets	£ 43,200		£ 44,893
Present value of funded obligations	(41,739)		(44,384)
Net pension scheme asset	1,461		509
Other post-retirement schemes	(142)		(144)
Net retirement benefit asset	1,319		365
Recognised on the balance sheet as:
Retirement benefit assets	1,584	£ 723	723	£ 723
Retirement benefit obligations	(265)		(358)
Net retirement benefit asset	£ 1,319		£ 365

The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [member]]

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The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Insurance contracts [member]]

+ References

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

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