Consolidated Statements of Cash Flows - PHI - 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
Deferred income taxes and amortization of investment tax credits	319	255	18
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
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 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
Issuance of long-term debt	5,825	6,309	3,481
Retirement of long-term debt	(1,713)	(2,073)	(1,640)
Other financing activities	(114)	(102)	(80)
Net cash flows provided by financing activities	2,683	1,591	758
(Decrease) increase 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
Pepco Holdings LLC
Cash flows from operating activities
Net income	590	608	561
Adjustments to reconcile net income to net cash flows used in operating activities:
Depreciation and amortization	990	938	821
Gain on sales of assets	(9)	0	0
Deferred income taxes and amortization of investment tax credits	29	(9)	24
Other non-cash operating activities	110	163	(12)
Changes in assets and liabilities:
Accounts receivable	(79)	(184)	(48)
Inventories	(42)	(34)	(16)
Accounts payable and accrued expenses	40	30	34
Collateral (paid) received, net	(196)	148	49
Income taxes	65	(1)	17
Regulatory assets and liabilities, net	(61)	(136)	(99)
Pension and non-pension postretirement benefit contributions	(24)	(78)	(48)
Other assets and liabilities	(101)	(149)	(132)
Net cash flows provided by operating activities	1,304	1,250	1,157
Cash flows from investing activities
Capital expenditures	(1,988)	(1,709)	(1,720)
Proceeds from sales of assets and businesses	10	0	0
Other investing activities	8	6	2
Net cash flows used in investing activities	(1,970)	(1,703)	(1,718)
Cash flows from financing activities
Changes in short-term borrowings	(20)	(54)	100
Issuance of long-term debt	1,075	925	825
Retirement of long-term debt	(500)	(310)	(260)
Change in Exelon intercompany money pool	21	37	(14)
Distributions to member	(513)	(750)	(703)
Contributions from member	475	787	683
Other financing activities	(41)	(22)	(17)
Net cash flows provided by financing activities	497	613	614
(Decrease) increase in cash, restricted cash, and cash equivalents	(169)	160	53
Cash, restricted cash, and cash equivalents at beginning of period	373	213	160
Cash, restricted cash, and cash equivalents at end of period	204	373	213
Supplemental cash flow information
(Decrease) increase in capital expenditures not paid	(109)	136	(6)
Pepco Holdings LLC | Related Party
Changes in assets and liabilities:
Receivables from and payables to affiliates, net	$ (8)	$ (46)	$ 6