Income Taxes - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Income Tax Additional Narrative Information [Line Items]
Income tax expense related to separation	$ 148
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	67
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	40
Income Tax Credits and Adjustments	15
Income Taxes Receivable, Current	55
Notes Payable, Current	11
Notes Payable, Noncurrent	484
State and Local Jurisdiction [Member] | Atlantic City Electric Company [Member]
Income Tax Additional Narrative Information [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	14
Federal and State
Income Tax Additional Narrative Information [Line Items]
Income Tax Credits and Adjustments	17
Total transaction costs taxes relating to the Separation	$ 24