Do margin debit balances and short stock collateral cancel each other out?

Long Stock + Long Options - Short options are part of the Type 2 Margin account. Short stock is a Type 3 account and does not provide an offset to prevent borrowing funds. If your Type 2 balance exceeds your equity, you are borrowing money.

$2M long stock
-$1M margin
$1M nav

If I then short $1M worth of stock is my effective margin $0?
 
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