| 2017 Fair value |
2016 Fair value |
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| Assets £m |
Liabilities £m |
Assets £m |
Liabilities £m |
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Net investment hedges – Foreign exchange contracts (principal amount – £6,333 million (2016 – £5,362 million)) |
5 | (25 | ) | 18 | (92 | ) | ||||||||||
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Cash flow hedges – Foreign exchange contracts (principal amount – £38 million (2016 – £170 million)) |
— | (1 | ) | 5 | — | |||||||||||
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Derivatives designated as at fair value through profit or loss |
5 | (26 | ) | 23 | (92 | ) | ||||||||||
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Foreign exchange contracts (principal amount – £14,449 million (2016 – £14,943 million)) |
62 | (47 | ) | 133 | (99 | ) | ||||||||||
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Embedded and other derivatives |
9 | (1 | ) | — | (3 | ) | ||||||||||
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Derivatives classified as held for trading under IAS 39 |
71 | (48 | ) | 133 | (102 | ) | ||||||||||
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Total derivative instruments |
76 | (74 | ) | 156 | (194 | ) | ||||||||||
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