Key Inclusion Criteria:

        A patient must meet the following criteria to be eligible for inclusion in the study:

          1. Patients with histologically or cytologically documented squamous or non squamous
             NSCLC with stage IIIB or stage IIIC disease who are not candidates for treatment with
             definitive concurrent chemoradiation or patients with stage IV disease who received no
             prior systemic treatment for recurrent or metastatic NSCLC

          2. Archival or newly obtained formalin-fixed tumor tissue from a metastatic/recurrent
             site, which has not previously been irradiated

          3. Tumor cells expressing PD L1 above a specific percentage of tumor cells by IHC
             performed by the central laboratory

          4. At least 1 radiographically measureable lesion per RECIST 1.1

          5. ECOG performance status of ≤1

          6. Anticipated life expectancy of at least 3 months

          7. Adequate organ and bone marrow function

        Key Exclusion Criteria:

        A patient who meets any of the following criteria will be excluded from the study:

          1. Patients that have never smoked, defined as smoking <100 cigarettes in a lifetime

          2. Active or untreated brain metastases or spinal cord compression

          3. Patients with tumors tested positive for EGFR gene mutations, ALK gene translocations,
             or ROS1 fusions

          4. Encephalitis, meningitis, or uncontrolled seizures in the year prior to randomization

          5. History of interstitial lung disease (eg, idiopathic pulmonary fibrosis, organizing
             pneumonia) or active, noninfectious pneumonitis that required immune-suppressive doses
             of glucocorticoids to assist with management. A history of radiation pneumonitis in
             the radiation field is permitted as long as pneumonitis resolved ≥6 months prior to
             randomization

          6. Patients with active, known, or suspected autoimmune disease that has required
             systemic therapy in the past 2 years

          7. Patients with a condition requiring corticosteroid therapy (>10 mg prednisone/day or
             equivalent) within 14 days of randomization

          8. Another malignancy that is progressing or requires treatment

          9. Uncontrolled infection with hepatitis B or hepatitis C or human immunodeficiency virus
             (HIV) or diagnosis of immunodeficiency

         10. Active infection requiring systemic therapy within 14 days prior to randomization

         11. Prior therapy with anti-PD 1 or anti-PD L1

         12. Treatment-related immune-mediated AEs from immune-modulatory agents

         13. Receipt of an investigational drug or device within 30 days

         14. Receipt of a live vaccine within 30 days of planned start of study medication

         15. Major surgery or significant traumatic injury within 4 weeks prior to first dose

         16. Documented allergic or acute hypersensitivity reaction attributed to antibody
             treatments

         17. Known psychiatric or substance abuse disorder that would interfere with participation
             with the requirements of the study, including current use of any illicit drugs

         18. Pregnant or breastfeeding women

         19. Women of childbearing potential or men who are unwilling to practice highly effective
             contraception prior to the initial dose/start of the first treatment, during the
             study, and for at least 6 months after the last dose

        Note: Other protocol defined Inclusion/Exclusion criteria apply.