Revenue Recognition Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

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

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

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

Contract Assets	Exelon and Generation
Balance as of January 1, 2018	$	283
Increases as a result of changes in the estimate of the stage of completion	50
Amounts reclassified to receivables	(146		)
Balance at December 31, 2018	$	187

The Utility Registrants do not have any contract assets.

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

Contract Liabilities	Exelon			Generation
Balance as of January 1, 2018	$	35		$	35
Increases as a result of additional cash received or due	179			465
Amounts recognized into revenues	(187		)	(458		)
Balance at December 31, 2018	$	27		$	42

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

	2019		2020		2021		2022		2023 and thereafter		Total
Exelon	$	631	$	329	$	119	$	47	$	138	$	1,264
Generation	631		329		119		47		138		1,264