Massive Mark-to-Market 'Losses': Fed Swap Lines

As of September 30th:
$314 bn outstanding swap and mark-to-market “losses” of over $10 bn

The latest data, November 14th, shows a “carrying value” of about $563 bn for outstanding swaps in the region of $600 bn+

From various sources: H.4.1, U.S. International Reserve Position, Treasury and Federal Reserve FX operations.

Note:
Why “losses” and not losses:
Valuation adjustments on swap-related holdings do not affect profit and loss because the impact is offset by the unwinding of the forward contract at the repayment date.