Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following table disaggregates revenues by major source:

	Three Months Ended March 31,
	2018			2017
	(in millions)
Revenue from contracts	$	761		$	644
Other (1)	(6		)	(6		)
	$	755		$	638

(1) Primarily consists of income from ARPs and leases. ARPs are contracts between Houston Electric and the PUCT, not between Houston Electric and a customer. Houston Electric recognizes ARP revenue as other revenues when the PUCT-specified conditions for recognition have been met. Upon recovery of ARP revenue through incorporation in rates charged for utility service to customers, ARP revenue is reversed and recorded as revenue from contracts with customers. The recognition of ARP revenues and the reversal of ARP revenues upon recovery through rates charged for utility service may not occur in the same period.