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.