Organization and Basis of Presentation Organization and Basis of Presentation (Details) - USD ($)
$ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
| Cash and Cash Equivalents |
|
$ 118
|
$ 313
|
|
|
| Cash, Cash Equivalents and Restricted Cash |
|
134
|
315
|
$ 197
|
$ 426
|
| PSE And G [Member] |
|
|
|
|
|
| Cash and Cash Equivalents |
|
48
|
242
|
|
|
| Cash, Cash Equivalents and Restricted Cash |
|
64
|
244
|
157
|
393
|
| Power [Member] |
|
|
|
|
|
| Cash and Cash Equivalents |
|
11
|
32
|
|
|
| Cash, Cash Equivalents and Restricted Cash |
|
11
|
32
|
$ 18
|
$ 11
|
| Other Entities [Member] |
|
|
|
|
|
| Cash and Cash Equivalents |
[1] |
59
|
39
|
|
|
| Cash, Cash Equivalents and Restricted Cash |
[1] |
59
|
39
|
|
|
| Other Current Assets [Member] |
|
|
|
|
|
| Restricted Cash in Other Current Assets |
|
14
|
0
|
|
|
| Other Current Assets [Member] | PSE And G [Member] |
|
|
|
|
|
| Restricted Cash in Other Current Assets |
|
14
|
0
|
|
|
| Other Current Assets [Member] | Power [Member] |
|
|
|
|
|
| Restricted Cash in Other Current Assets |
|
0
|
0
|
|
|
| Other Current Assets [Member] | Other Entities [Member] |
|
|
|
|
|
| Restricted Cash in Other Current Assets |
[1] |
0
|
0
|
|
|
| Other Noncurrent Assets [Member] |
|
|
|
|
|
| Restricted Cash in Other Noncurrent Assets |
|
2
|
2
|
|
|
| Other Noncurrent Assets [Member] | PSE And G [Member] |
|
|
|
|
|
| Restricted Cash in Other Noncurrent Assets |
|
2
|
2
|
|
|
| Other Noncurrent Assets [Member] | Power [Member] |
|
|
|
|
|
| Restricted Cash in Other Noncurrent Assets |
|
0
|
0
|
|
|
| Other Noncurrent Assets [Member] | Other Entities [Member] |
|
|
|
|
|
| Restricted Cash in Other Noncurrent Assets |
[1] |
$ 0
|
$ 0
|
|
|
|
|