Revenue from Contracts with Customers Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer (All Registrants) [Abstract]

Contract with Customer, Asset and Liability [Table Text Block]

The following table provides a rollforward of the contract assets and liabilities reflected in Exelon's and Generation's Consolidated Balance Sheets from January 1, 2018 to December 31, 2019:

	Contract Assets						Contract Liabilities
	Exelon			Generation			Exelon			Generation
Balance as of January 1, 2018	$	283		$	283		$	35		$	35
Consideration received or due	(146		)	(146		)	179			465
Revenues recognized	50			50			(187		)	(458		)
Balance at December 31, 2018	187			187			27			42
Consideration received or due	(143		)	(143		)	94			287
Revenues recognized	130			130			(88		)	(258		)
Balance at December 31, 2019	$	174		$	174		$	33		$	71

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

This disclosure excludes Generation’s power and gas sales contracts as they contain variable volumes and/or variable pricing. This disclosure also excludes the Utility Registrants’ gas and electric tariff sales contracts and transmission revenue contracts as they generally have an original expected duration of one year or less and, therefore, do not contain any future, unsatisfied performance obligations to be included in this disclosure.

	2020		2021		2022		2023		2024 and thereafter		Total
Exelon	$	400	$	141	$	65	$	45	$	199	$	850
Generation	501		196		80		45		199		1,021