In what could be termed as the largest private equity deal in the country, ICICI Ventures has paid $800 million (Rs 3,200 crore) for stake in Delhi-based Jaypee Infratech.ICICI Ventures is paying $800 million to buy about 5 per cent stake. This picking of stake is being done in a combination of equity and convertible debentures, which values the company at about $12-15 billion.