v3.10.0.1
Basis of preparation and new accounting standards, interpretations and amendments Areas of judgement and key sources of estimation uncertainty (Details) - 6 months ended Sep. 30, 2018 - Exceptional items [Member]
£ in Millions, $ in Millions
GBP (£)
USD ($)
Disclosure of other provisions [line items]    
Employee benefits expense £ 97 $ 127
Expense of restructuring activities 127  
Proceeds from legal settlements £ 94