public void setBillingPeriod(String billingPeriod) {
        this.billingPeriod = billingPeriod;
    }
<p>
The preferred billing period for your report.
</p>

@param billingPeriod
       The preferred billing period for your report.
aws-java-sdk-billingconductor/src/main/java/com/amazonaws/services/billingconductor/model/ListBillingGroupCostReportsRequest.java