A Study of Venetoclax in Combination With Bendamustine + Rituximab or Bendamustine + Obinutuzumab in Participants With Relapsed/Refractory or Previously Untreated Chronic Lymphocytic Leukemia (CLL)

Participants will receive intravenous (IV) infusion of bendamustine (90 or 70 milligrams per square meter \[mg/m\^2\]) on Days 2-3 of Cycle 1 and Days 1-2 of Cycles 2-6.

Participants will receive IV infusion of obinutuzumab (100 milligrams \[mg\]) on Day 1 of Cycle 1; 900 mg administered on Day 2 of Cycle 1; and 1000 mg administered on Days 8 and 15 of Cycle 1 and on Day 1 of Cycles 2-6.

Participants will receive IV infusion of rituximab (375 mg/m\^2) on Day 1 of Cycle 1 and 500 mg/m\^2 administered on Day 1 of Cycles 2-6.

Participants will receive multiple doses of venetoclax orally once daily.