A Study of Nivolumab and Ipilimumab in Untreated Participants With Stage 3 Non-small Cell Lung Cancer (NSCLC) That is Unable or Not Planned to be Removed by Surgery

Inclusion Criteria: * Eastern Cooperative Oncology Group (ECOG) performance status ≤1 * Locally advanced stage IIIA, IIIB, or IIIC (T1-2 N2-3 M0, T3 N1-3 M0, or T4 N0-3 M0) pathologically-confirmed NSCLC, according to 8th TNM classification. Participants who are not planned for potential curative surgical resection are eligible. * Newly diagnosed and treatment-naïve, with no prior local or systemic anticancer therapy given as primary therapy for locally advanced disease Exclusion Criteria: * Any condition including medical, emotional, psychiatric, or logistical that, in the opinion of the Investigator would preclude the participant from adhering to the protocol or would increase the risk associated with study participation * Active infection requiring systemic therapy within 14 days prior to randomization * History of organ or tissue transplant that requires systemic use of immune suppressive agents * Prior thoracic radiotherapy Other protocol-defined inclusion/exclusion criteria apply