AM Best has revised the outlooks to negative from stable and affirmed the Financial Strength Rating of A- [Excellent] and the Long-Term Issuer Credit Rating of “a-” [Excellent] of Nissan Global Reinsurance, Ltd. [NGRe] [Hamilton, Bermuda]. The ratings agency said, “The Credit Ratings [ratings] reflect NGRe’s balance sheet strength, which AM Best assesses as very strong, …