|
Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2012
|
|
| Operating Loss Carryforwards [Line Items] | |
| Option price to purchase generating facility at end of lease | $ 923 |
|
State and Local Jurisdiction
|
|
| Operating Loss Carryforwards [Line Items] | |
| Reduction of valuation allowance | $ 22 |