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Property, Plant and Equipment (Regulated and Non-Regulated Generation and Distribution PP&E) (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |  |  |
Property plant and equipment, net of accumulated depreciation mortgaged, pledged or subject to liens | $ 15,000,000,000 |  | $ 16,000,000,000 |
Electric generation, distribution assets and other | 30,596,000,000 |  | 30,278,000,000 |
Accumulated depreciation | (9,604,000,000) |  | (9,145,000,000) |
Net electric generation and distribution assets and other | 20,992,000,000 | [1],[2] | 21,133,000,000 | [1],[2]
Regulated |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Electric generation, distribution assets and other | 13,031,000,000 |  | 13,395,000,000 |
Accumulated depreciation | (4,732,000,000) |  | (4,711,000,000) |
Net electric generation and distribution assets and other | 8,299,000,000 |  | 8,684,000,000 |
Non Regulated |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Electric generation, distribution assets and other | 17,565,000,000 |  | 16,883,000,000 |
Accumulated depreciation | (4,872,000,000) |  | (4,434,000,000) |
Net electric generation and distribution assets and other | $ 12,693,000,000 |  | $ 12,449,000,000 |
[1] | Net electric generation and distribution assets and other related to the Company's held-for-sale businesses of $1.2 billion and $1.3 billion as of December 31, 2013 and 2012, respectively, were excluded from the table above and were included in the noncurrent assets of discontinued and held-for-sale businesses in the consolidated balance sheets.
[2] | Net electric generation and distribution assets, and other include unamortized internal use software costs of $133 million and $141 million as of December 31, 2013 and 2012, respectively.

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