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Property, Plant and Equipment (Components of PP&E) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other |  | $ 28,491 | $ 30,459
Accumulated depreciation |  | (9,449) | (9,962)
Property, Plant and Equipment, Net | [1] | 19,042 | 20,497
Capitalized computer software, net |  | 83 | 115
Electric generation and distribution facilities |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other |  | $ 25,427 | 27,488
Electric generation and distribution facilities | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life |  | 5 years |
Electric generation and distribution facilities | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life |  | 68 years |
Other buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other |  | $ 1,868 | 1,694
Other buildings | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life |  | 3 years |
Other buildings | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life |  | 53 years |
Furniture and Fixtures [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other |  | $ 305 | 307
Furniture and Fixtures [Member] | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life |  | 2 years |
Furniture and Fixtures [Member] | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life |  | 31 years |
Other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Electric generation, distribution assets and other |  | $ 891 | $ 970
Other | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life |  | 1 year |
Other | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life |  | 50 years |
[1] | (1) Net electric generation and distribution assets and other include unamortized internal-use software costs of $83 million and $115 million as of December 31, 2015 and 2014, respectively.

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