3 billion euro mtn, page-8

Those of you who suffer from insomnia might want to read the Note document as a cure!

That said, the Notes do not NECESSARILY involve foreign exchange risk to WES, which as noted, may be partially offset by natural hedges.

On top of that, the Note document states:

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Specified Currencies: Subject to any applicable legal or regulatory restrictions, any currency agreed between the Issuer and the relevant Dealer.

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That means that WES doesn't have to bear the foreign exchange risk: they could Issue in A$ and one of their Dealers could bear and/or hedge the foreign exchange risk at their option. (I would expect they would hedge it: the risk appetite of your average investment bank is much different than it was a year ago!)