Folks, please keep in mind that this is a mark-to-market loss, not an actual, realized loss.
In the fourth quarter of 2021, Ford booked a huge gain on its Rivian investment - again, because it marks the investment to market.
The fact that Ford previously marked-up this investment (i.e., recognized a mark-to-market gain) means that it's not a simple task to figure out whether or not Ford would in fact have lost actual money on this investment if it were to sell the shares today.