Here is a list of the highest rated life insurance companies for financial strength:

New York Life

Northwestern Mutual 

TIAA-CREF 

USAA

They all have the highest financial ratings an insurance company can achieve from the credit rating agencies.

You can visit AM Best Company, Moody's or Standard & Poor's to check on the financial strength ratings of insurance companies.

Here is a list of the Top 10 Life Insurance Companies and their financial strength ratings from AM Best Company.