detailedStatus property

CANCELLED: The operation in the specified account and Region has been cancelled. This is either because a user has stopped the stack set operation, or because the failure tolerance of the stack set operation has been exceeded.
FAILED: The operation in the specified account and Region failed. If the stack set operation fails in enough accounts within a Region, the failure tolerance for the stack set operation as a whole might be exceeded.
INOPERABLE: A DeleteStackInstances operation has failed and left the stack in an unstable state. Stacks in this state are excluded from further UpdateStackSet operations. You might need to perform a DeleteStackInstances operation, with RetainStacks set to true, to delete the stack instance, and then delete the stack manually.
PENDING: The operation in the specified account and Region has yet to start.
RUNNING: The operation in the specified account and Region is currently in progress.
SUCCEEDED: The operation in the specified account and Region completed successfully.

Implementation