|
Severance - Ongoing Severance Plans (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2014
|
Sep. 30, 2013
|
|
| Corporate Restructuring Severance Benefit Obligation [Line Items] | ||||
| Severance charges recorded | $ (2) | $ 12 | $ 4 | $ 14 |
|
Exelon Generation Co L L C [Member]
|
||||
| Corporate Restructuring Severance Benefit Obligation [Line Items] | ||||
| Severance charges recorded | (2) | 11 | 3 | 12 |
|
Commonwealth Edison Co [Member]
|
||||
| Corporate Restructuring Severance Benefit Obligation [Line Items] | ||||
| Severance charges recorded | 0 | 1 | 1 | 2 |
|
PECO Energy Co [Member]
|
||||
| Corporate Restructuring Severance Benefit Obligation [Line Items] | ||||
| Severance charges recorded | 0 | 0 | 0 | 0 |
|
Baltimore Gas and Electric Company [Member]
|
||||
| Corporate Restructuring Severance Benefit Obligation [Line Items] | ||||
| Severance charges recorded | $ 0 | $ 0 | $ 0 | $ 0 |