Discontinued Operations and Disposal Groups (Details) - Balance Sheet - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Discontinued Operations - Income Statement
Restricted cash	$ 381	$ 566	$ 430	$ 321
Customer accounts receivable	2,493	2,544
Accounts Receivable, Allowance for Credit Loss, Current	(389)	(327)
Other accounts receivable	1,346	1,426
Allowance for Credit Loss, Receivable, Other, Current	(91)	(82)
Other Receivables, Net, Current	1,255	1,344
Fossil fuel and emission allowances	70	208
Materials and supplies inventory, net	582	547
Accumulated depreciation and amortization	16,384	15,930
Investments	234	232
Other Assets, Noncurrent	1,220	1,141
Assets	96,925	95,349
Short-term Debt	1,306	2,586
Long-term Debt and Lease Obligation, Current	1,356	1,802
Mark-to-market derivative liabilities (current liabilities)	23	8
Long-term Debt, Excluding Current Maturities	38,732	35,272
Deferred income taxes and unamortized investment tax credits	11,483	11,250
Asset retirement obligations, noncurrent	270	269
Derivative Liability, Noncurrent	77	83
Other	1,869	1,967
Total Liabilities	71,859	70,605
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Assets	0	0
Total Liabilities	$ 0	$ 0