Consolidated Statements of Cash Flows - Exelon - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net income	$ 2,328	$ 2,171	$ 1,829
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization	3,506	3,533	7,573
Asset impairments	0	48	552
Gain on sales of assets and businesses	(10)	(8)	(201)
Deferred income taxes and amortization of investment tax credits	319	255	18
Net fair value changes related to derivatives	22	(53)	(568)
Net realized and unrealized gains on NDT fund investments	0	205	(586)
Net unrealized losses (gains) on equity investments	0	16	160
Other non-cash operating activities	(335)	370	(200)
Changes in assets and liabilities:
Accounts receivable	(37)	(1,222)	(703)
Inventories	(45)	(121)	(141)
Accounts payable and accrued expenses	(191)	1,318	440
Option premiums paid, net	0	(39)	(338)
Collateral (paid) received, net	(146)	1,248	(74)
Income taxes	48	(4)	327
Regulatory assets and liabilities, net	439	1,326	634
Pension and non-pension postretirement benefit contributions	(129)	(616)	(665)
Other assets and liabilities	(188)	(905)	(3,777)
Net cash flows provided by operating activities	4,703	4,870	3,012
Cash flows from investing activities
Capital expenditures	(7,408)	(7,147)	(7,981)
Proceeds from NDT fund sales	0	488	6,532
Investment in NDT funds	0	(516)	(6,673)
Collection of DPP	0	169	3,902
Proceeds from sales of assets and businesses	25	16	877
Other investing activities	8	0	26
Net cash flows used in investing activities	(7,375)	(6,990)	(3,317)
Cash flows from financing activities
Changes in short-term borrowings	(313)	986	269
Proceeds from short-term borrowings with maturities greater than 90 days	400	1,300	1,380
Repayments on short-term borrowings with maturities greater than 90 days	(150)	(1,500)	(350)
Issuance of long-term debt	5,825	6,309	3,481
Retirement of long-term debt	(1,713)	(2,073)	(1,640)
Proceeds from Issuance of Common Stock	140	563	0
Dividends paid on common stock	(1,433)	(1,334)	(1,497)
Acquisition of CENG noncontrolling interest	0	0	(885)
Proceeds from employee stock plans	41	36	80
Transfer of cash, restricted cash, and cash equivalents to Constellation	0	(2,594)	0
Other financing activities	(114)	(102)	(80)
Net cash flows provided by (used in) financing activities	2,683	1,591	758
Increase (decrease) in cash, restricted cash, and cash equivalents	11	(529)	453
Cash, restricted cash, and cash equivalents at beginning of period	1,090	1,619	1,166
Cash, restricted cash, and cash equivalents at end of period	1,101	1,090	1,619
Supplemental cash flow information
(Decrease) increase in capital expenditures not paid	(215)	36	16
Increase in DPP	0	348	3,652
(Decrease) increase in PP&E related to ARO update	$ (13)	$ 332	$ 642