Commitments and Contingencies - Schedule of Commercial Commitments (Details)
$ in Millions |
Sep. 30, 2026
USD ($)
|
| Other Commitments [Line Items] |
|
| Other Commitment |
$ 930
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
82
|
| Other Commitment, to be Paid, Year One |
280
|
| Other Commitment, to be Paid, Year Two |
249
|
| Other Commitment, to be Paid, Year Three |
4
|
| Other Commitment, to be Paid, Year Four |
4
|
| Other Commitment, to be Paid, Year Five and Beyond |
311
|
| Guarantor Obligations, Maximum Exposure, Undiscounted |
59
|
| Letters of Credit |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
55
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
10
|
| Other Commitment, to be Paid, Year One |
45
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Surety Bonds |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
472
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
72
|
| Other Commitment, to be Paid, Year One |
235
|
| Other Commitment, to be Paid, Year Two |
165
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Financing trust guarantees |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
378
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
0
|
| Other Commitment, to be Paid, Year Two |
78
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
300
|
| Guaranteed lease residual values |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
25
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
0
|
| Other Commitment, to be Paid, Year Two |
6
|
| Other Commitment, to be Paid, Year Three |
4
|
| Other Commitment, to be Paid, Year Four |
4
|
| Other Commitment, to be Paid, Year Five and Beyond |
11
|
| Commonwealth Edison Co |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
359
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
14
|
| Other Commitment, to be Paid, Year One |
145
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
200
|
| Commonwealth Edison Co | Letters of Credit |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
15
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
4
|
| Other Commitment, to be Paid, Year One |
11
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Commonwealth Edison Co | Surety Bonds |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
144
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
10
|
| Other Commitment, to be Paid, Year One |
134
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Commonwealth Edison Co | Financing trust guarantees |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
200
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
0
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
200
|
| PECO Energy Co |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
201
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
23
|
| Other Commitment, to be Paid, Year Two |
78
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
100
|
| PECO Energy Co | Letters of Credit |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
4
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
4
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| PECO Energy Co | Surety Bonds |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
19
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
19
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| PECO Energy Co | Financing trust guarantees |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
178
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
0
|
| Other Commitment, to be Paid, Year Two |
78
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
100
|
| Baltimore Gas and Electric Company |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
120
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
5
|
| Other Commitment, to be Paid, Year One |
28
|
| Other Commitment, to be Paid, Year Two |
87
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Baltimore Gas and Electric Company | Letters of Credit |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
27
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
4
|
| Other Commitment, to be Paid, Year One |
23
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Baltimore Gas and Electric Company | Surety Bonds |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
93
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
1
|
| Other Commitment, to be Paid, Year One |
5
|
| Other Commitment, to be Paid, Year Two |
87
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Pepco Holdings LLC |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
188
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
57
|
| Other Commitment, to be Paid, Year One |
28
|
| Other Commitment, to be Paid, Year Two |
84
|
| Other Commitment, to be Paid, Year Three |
4
|
| Other Commitment, to be Paid, Year Four |
4
|
| Other Commitment, to be Paid, Year Five and Beyond |
11
|
| Guarantor Obligations, Maximum Exposure, Undiscounted |
59
|
| Pepco Holdings LLC | Letters of Credit |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
6
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
6
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Pepco Holdings LLC | Surety Bonds |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
157
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
57
|
| Other Commitment, to be Paid, Year One |
22
|
| Other Commitment, to be Paid, Year Two |
78
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Pepco Holdings LLC | Guaranteed lease residual values |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
25
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
0
|
| Other Commitment, to be Paid, Year Two |
6
|
| Other Commitment, to be Paid, Year Three |
4
|
| Other Commitment, to be Paid, Year Four |
4
|
| Other Commitment, to be Paid, Year Five and Beyond |
11
|
| Potomac Electric Power Company |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
155
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
51
|
| Other Commitment, to be Paid, Year One |
17
|
| Other Commitment, to be Paid, Year Two |
80
|
| Other Commitment, to be Paid, Year Three |
1
|
| Other Commitment, to be Paid, Year Four |
2
|
| Other Commitment, to be Paid, Year Five and Beyond |
4
|
| Guarantor Obligations, Maximum Exposure, Undiscounted |
21
|
| Potomac Electric Power Company | Letters of Credit |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
3
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
3
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Potomac Electric Power Company | Surety Bonds |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
143
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
51
|
| Other Commitment, to be Paid, Year One |
14
|
| Other Commitment, to be Paid, Year Two |
78
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Potomac Electric Power Company | Guaranteed lease residual values |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
9
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
0
|
| Other Commitment, to be Paid, Year Two |
2
|
| Other Commitment, to be Paid, Year Three |
1
|
| Other Commitment, to be Paid, Year Four |
2
|
| Other Commitment, to be Paid, Year Five and Beyond |
4
|
| Delmarva Power and Light Company |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
18
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
3
|
| Other Commitment, to be Paid, Year One |
6
|
| Other Commitment, to be Paid, Year Two |
2
|
| Other Commitment, to be Paid, Year Three |
2
|
| Other Commitment, to be Paid, Year Four |
1
|
| Other Commitment, to be Paid, Year Five and Beyond |
4
|
| Guarantor Obligations, Maximum Exposure, Undiscounted |
21
|
| Delmarva Power and Light Company | Letters of Credit |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
1
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
1
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Delmarva Power and Light Company | Surety Bonds |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
8
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
3
|
| Other Commitment, to be Paid, Year One |
5
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Delmarva Power and Light Company | Guaranteed lease residual values |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
9
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
0
|
| Other Commitment, to be Paid, Year Two |
2
|
| Other Commitment, to be Paid, Year Three |
2
|
| Other Commitment, to be Paid, Year Four |
1
|
| Other Commitment, to be Paid, Year Five and Beyond |
4
|
| Atlantic City Electric Company |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
15
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
3
|
| Other Commitment, to be Paid, Year One |
5
|
| Other Commitment, to be Paid, Year Two |
2
|
| Other Commitment, to be Paid, Year Three |
1
|
| Other Commitment, to be Paid, Year Four |
1
|
| Other Commitment, to be Paid, Year Five and Beyond |
3
|
| Guarantor Obligations, Maximum Exposure, Undiscounted |
17
|
| Atlantic City Electric Company | Letters of Credit |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
2
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
2
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Atlantic City Electric Company | Surety Bonds |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
6
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
3
|
| Other Commitment, to be Paid, Year One |
3
|
| Other Commitment, to be Paid, Year Two |
0
|
| Other Commitment, to be Paid, Year Three |
0
|
| Other Commitment, to be Paid, Year Four |
0
|
| Other Commitment, to be Paid, Year Five and Beyond |
0
|
| Atlantic City Electric Company | Guaranteed lease residual values |
|
| Other Commitments [Line Items] |
|
| Other Commitment |
7
|
| Other Commitment, to be Paid, Remainder of Fiscal Year |
0
|
| Other Commitment, to be Paid, Year One |
0
|
| Other Commitment, to be Paid, Year Two |
2
|
| Other Commitment, to be Paid, Year Three |
1
|
| Other Commitment, to be Paid, Year Four |
1
|
| Other Commitment, to be Paid, Year Five and Beyond |
$ 3
|
| Minimum [Member] | Guaranteed lease residual values |
|
| Other Commitments [Line Items] |
|
| Lessor, Operating Lease, Term of Contract |
1 year
|
| Maximum [Member] | Guaranteed lease residual values |
|
| Other Commitments [Line Items] |
|
| Lessor, Operating Lease, Term of Contract |
9 years
|