Bharti Airtel Ltd and another group entity will sell a combined 20% in its satellite TV unit, Bharti Telemedia Ltd, to private equity firm Warburg Pincus for $350 million as Indias largest telecom company seeks to cut debt.The transaction will see Bharti Airtel sell 15% in Bharti Telemedia and another Bharti entity sell a 5% stake to an affiliate of the private equity firm, the telecom company said in a statement on Tuesday.