The US currency suffered its biggest one-day slide against the euro since the birth of the single European currency in January 1999 as the euro jumped from under $1.40 to above $1.44.
The yen powered higher, dragging the dollar to a 13-year low of nearly Y87 despite speculation that Tokyo could intervene to limit the rise in its currency and calls for the Bank of Japan to act more aggressively.
Following the Fed meeting on Tuesday, which reduced interest rates to a range of zero to 0.25 per cent, US rates are now lower than those in Japan for the first time since 1993.
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