Mich. Comp. Laws § 500.902

Sec. 902. (1) Except as otherwise provided in sections 942(7), (10), and (11), 943(2), and 946(4), this chapter does not prohibit the investment of a domestic insurer's capital and surplus in any asset otherwise permitted to be held by any other person or corporation under the laws of this state, provided the domestic insurer maintains qualified assets as described in this chapter in the amounts specified in section 901. (2) As used in this section, "qualified assets" means cash and those assets described in sections 910 to 947.