The massive infrastructure spend covers 2014-19.
Plans include the completion of Terminal 2 and the early works on extending the building, the development of a new integrated baggage system and the construction of new taxiways and stands.
Since 2003 Heathrow has invested £11bn in the airport including Terminal 5, a new Terminal 2 which is due to open in 2014, new baggage tunnels and the refurbishment of Terminals 3 & 4.
Colin Matthews, Chief Executive of Heathrow said: “Heathrow faces stiff competition from other European hubs and we must continue to improve the service we offers passengers and airlines.
“Our plan for a further £3 billion of private-sector investment will further improve the airport for passengers. The plan represents good value for money for airlines and passengers and comes at no cost to taxpayers.”
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