Discontinued Operations and Disposal Groups (Details) - Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Discontinued Operations - Income Statement
Depreciation and amortization	$ 2,616	$ 2,679
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	(8)
Deferred income taxes and amortization of investment tax credits	210	256
Net fair value changes related to derivatives	21	(59)
Net realized and unrealized (gains) losses on NDT funds	0	205
Net unrealized (gains) losses on equity investments	0	16
Other non-cash operating activities	237	(265)
Capital expenditures	(5,540)	(5,179)
Collection of deferred purchase price	0	169
Decrease in capital expenditures not paid	(169)	(147)
Increase in DPP	0	348
Exelon Generation Co L L C
Discontinued Operations - Income Statement
Depreciation and amortization	0	207
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	9
Deferred income taxes and amortization of investment tax credits	0	(143)
Net fair value changes related to derivatives	0	(59)
Net realized and unrealized (gains) losses on NDT funds	0	205
Net unrealized (gains) losses on equity investments	0	16
Other non-cash operating activities	0	36
Capital expenditures	0	(227)
Collection of deferred purchase price	0	169
Decrease in capital expenditures not paid	0	(128)
Increase in DPP	0	348
Increase in PPE related to ARO update	$ 0	$ 335