The chair of Parliament's Finance Committee is perplexed ANZ's head wasn't across the details of her pay packet. 

Chief executive Antonia Watson was among the banking heads grilled by MPs this morning, under pressure to justify a $2 billion profit during tough times for Kiwis.

She says she's paid $2.5 million, but would need to give her total remuneration including share options and bonuses, in writing. 

Stuart Smith says he wonders about that.

"I'd be very surprised if a senior bank executive wasn't interest in - to the dollar - in how much they're paid."

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