Claims, Lawsuits And Other Contingencies Claims, Lawsuits And Other Contingencies (Details) (GBP £) In Millions, unless otherwise specified	Sep. 30, 2013 Governmental Inquiries and Related Claims [Member] lawsuit	Dec. 31, 2013 Other Contingencies-Guarantees [Member]
Loss Contingencies [Line Items]
Number of actions instituted by policy holders	2
Amount reinsured by third party		£ 40