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

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

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

The following table provides a rollforward of the contract liabilities reflected on Exelon's and Generation's Consolidated Balance Sheet from January 1, 2018 to September 30, 2018:

Contract Liabilities	Exelon and Generation
Balance as of January 1, 2018	$	35
Increases as a result of additional cash received or due	389
Amounts recognized into revenues	(387		)
Balance at September 30, 2018	$	37

The following table provides a rollforward of the contract assets reflected on Exelon's and Generation's Consolidated Balance Sheets from January 1, 2018 to September 30, 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	34
Amounts reclassified to receivables	(120		)
Balance at September 30, 2018	$	197

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

	2019		2020		2021		2022		2023 and thereafter		Total
Exelon	$	647	$	302	$	119	$	47	$	137	$	1,252
Generation	647		302		119		47		137		1,252