terraform data account_id and region

data.tf

data "aws_caller_identity" "current" {} # data.aws_caller_identity.current.account_id
data "aws_region" "current" {} # data.aws_region.current.name

output "account_id" {
  description = "Selected AWS Account ID"
  value       = data.aws_caller_identity.current.account_id
}

output "region" {
  description = "Details about selected AWS region"
  value       = data.aws_region.current.name
}

no-hard-coded.tf

data "aws_default_tags" "current" {}

# The attribute `${data.aws_caller_identity.current.account_id}` will be current account number.
data "aws_caller_identity" "current" {}

# The attribue `${data.aws_iam_account_alias.current.account_alias}` will be current account alias
data "aws_iam_account_alias" "current" {}

# The attribute `${data.aws_region.current.name}` will be current region
data "aws_region" "current" {}

# The attribute `${data.aws_partition.current.partition}` will be current partition
data "aws_partition" "current" {}

# Set as [local values](https://www.terraform.io/docs/configuration/locals.html)
locals {
  account_id    = data.aws_caller_identity.current.account_id
  account_alias = data.aws_iam_account_alias.current.account_alias
  region        = data.aws_region.current.name
  partition     = data.aws_partition.current.partition
  default_tags  = data.aws_default_tags.current.tags
}