Discontinued Operations and Disposal Groups (Details) - Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Discontinued Operations - Income Statement
Depreciation, Amortization and Accretion, Net	$ 860	$ 1,024
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	(10)
Deferred income taxes and amortization of investment tax credits	113	110
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	138	(232)
Payments to Acquire Property, Plant, and Equipment	(1,881)	(1,922)
Collection of deferred purchase price	0	169
Decrease in capital expenditures not paid	(201)	(322)
Increase in deferred purchase price	0	348
Increase in PPE related to ARO update	0	(335)
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Depreciation, Amortization and Accretion, Net	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
Payments to Acquire Property, Plant, and Equipment	0	(227)
Collection of deferred purchase price	0	169
Decrease in capital expenditures not paid	0	(128)
Increase in deferred purchase price	0	348
Increase in PPE related to ARO update	$ 0	$ 335