For more information regarding BMS clinical trial participation, please visit www.BMSStudyConnect.com Inclusion Criteria: - Must have had invasive urothelial cancer at high risk of recurrence originating in the bladder, ureter, or renal pelvis - Must have had radical surgical resection (e.g. radical cystectomy), performed within the last 120 days - Must have disease free status as determined by imaging within 4 weeks of dosing - Tumor tissue must be provided for biomarker analysis - Patients who have not received prior neoadjuvant cisplatin chemotherapy must be ineligible for or refuse cisplatin-based adjuvant chemotherapy Exclusion Criteria: - Partial bladder or partial kidney removal (eg, partial cystectomy or partial nephrectomy) - Secondary Treatment (eg, adjuvant systemic chemotherapy for bladder cancer) following surgical removal of bladder cancer - Subjects with active, known or suspected autoimmune disease - Prior malignancy active within the previous 3 years except for locally curable cancers that have been apparently cured - Condition requiring systemic treatment with either corticosteroids or other immunosuppressive medications within 14 day of study drug administration - Positive test for hepatitis B virus surface antigen (HBV s Ag) or hepatitis C virus ribonucleic acid (HCV antibody) indicating acute or chronic infection