Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions |
Jan. 01, 2016 |
Sep. 30, 2016 |
Feb. 01, 2016 |
|---|---|---|---|
| Regulatory Assets and Liabilities Disclosure [Abstract] | |||
| Expected Modernization Investment | $ 300 | ||
| Modernization Program Recovery | $ 320 | ||
| Annual Capital Cost Recovery Mechanism Extension Limit | $ 1,100 |