Fair Value (Nonrecurring Measurements) (Details) (USD $)	12 Months Ended					3 Months Ended	12 Months Ended	3 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013 Itabo (San Lorenzo)	Dec. 31, 2013 DP&L (Conesville)	Dec. 31, 2013 DP&L	Dec. 31, 2012 DP&L	Sep. 30, 2013 Ebute	Dec. 31, 2013 MountainView	Dec. 31, 2012 St. Patrick	Dec. 31, 2013 Long Lived Assets Held And Used Itabo (San Lorenzo)	Dec. 31, 2013 Long Lived Assets Held And Used Beaver Valley	Dec. 31, 2013 Long Lived Assets Held And Used DP&L (Conesville)	Dec. 31, 2012 Long Lived Assets Held And Used Kelanitissa		Dec. 31, 2012 Long Lived Assets Held And Used U.S. wind projects		Dec. 31, 2013 Long Lived Assets Held For Sale U.S. wind turbines		Dec. 31, 2012 Long Lived Assets Held For Sale U.S. wind turbines		Dec. 31, 2012 Long Lived Assets Held For Sale St. Patrick		Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses Cameroon		Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses Saurashtra		Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses Ukraine utilities		Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses Poland wind projects		Dec. 31, 2013 Discontinued Operations and Held for Sale Businesses U.S. wind projects		Dec. 31, 2012 Discontinued Operations and Held for Sale Businesses Tisza II		Dec. 31, 2013 Equity Method Affiliate	Dec. 31, 2012 Equity Method Affiliate		Dec. 31, 2013 Goodwill DP&L		Dec. 31, 2012 Goodwill DP&L	Dec. 31, 2013 Goodwill Ebute		Dec. 31, 2013 Goodwill MountainView		Dec. 31, 2013 Carrying Amount Long Lived Assets Held And Used Itabo (San Lorenzo)		Dec. 31, 2013 Carrying Amount Long Lived Assets Held And Used Beaver Valley		Dec. 31, 2013 Carrying Amount Long Lived Assets Held And Used DP&L (Conesville)		Dec. 31, 2012 Carrying Amount Long Lived Assets Held And Used Kelanitissa		Dec. 31, 2012 Carrying Amount Long Lived Assets Held And Used U.S. wind projects		Dec. 31, 2013 Carrying Amount Long Lived Assets Held For Sale U.S. wind turbines		Dec. 31, 2012 Carrying Amount Long Lived Assets Held For Sale U.S. wind turbines		Dec. 31, 2012 Carrying Amount Long Lived Assets Held For Sale St. Patrick		Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses Cameroon		Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses Saurashtra		Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses Ukraine utilities		Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses Poland wind projects		Dec. 31, 2013 Carrying Amount Discontinued Operations and Held for Sale Businesses U.S. wind projects		Dec. 31, 2012 Carrying Amount Discontinued Operations and Held for Sale Businesses Tisza II		Dec. 31, 2013 Carrying Amount Equity Method Affiliate		Dec. 31, 2012 Carrying Amount Equity Method Affiliate		Dec. 31, 2013 Carrying Amount Goodwill DP&L		Dec. 31, 2012 Carrying Amount Goodwill DP&L	Dec. 31, 2013 Carrying Amount Goodwill Ebute		Dec. 31, 2013 Carrying Amount Goodwill MountainView		Dec. 31, 2013 Fair Value Level 3	Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Itabo (San Lorenzo) Level 1		Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Itabo (San Lorenzo) Level 2		Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Itabo (San Lorenzo) Level 3		Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Beaver Valley Level 1		Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Beaver Valley Level 2		Dec. 31, 2013 Fair Value Long Lived Assets Held And Used Beaver Valley Level 3		Dec. 31, 2013 Fair Value Long Lived Assets Held And Used DP&L (Conesville) Level 1		Dec. 31, 2013 Fair Value Long Lived Assets Held And Used DP&L (Conesville) Level 2		Dec. 31, 2013 Fair Value Long Lived Assets Held And Used DP&L (Conesville) Level 3		Dec. 31, 2012 Fair Value Long Lived Assets Held And Used Kelanitissa Level 1		Dec. 31, 2012 Fair Value Long Lived Assets Held And Used Kelanitissa Level 2		Dec. 31, 2012 Fair Value Long Lived Assets Held And Used Kelanitissa Level 3		Dec. 31, 2012 Fair Value Long Lived Assets Held And Used U.S. wind projects Level 1		Dec. 31, 2012 Fair Value Long Lived Assets Held And Used U.S. wind projects Level 2		Dec. 31, 2012 Fair Value Long Lived Assets Held And Used U.S. wind projects Level 3		Dec. 31, 2013 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 1		Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 1		Dec. 31, 2013 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 2		Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 2		Dec. 31, 2013 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 3		Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale U.S. wind turbines Level 3		Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale St. Patrick Level 1		Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale St. Patrick Level 2		Dec. 31, 2012 Fair Value Long Lived Assets Held For Sale St. Patrick Level 3		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Cameroon Level 1		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Cameroon Level 2		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Cameroon Level 3		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Saurashtra Level 1		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Saurashtra Level 2		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Saurashtra Level 3		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Ukraine utilities Level 1		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Ukraine utilities Level 2		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Ukraine utilities Level 3		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Poland wind projects Level 1		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Poland wind projects Level 2		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses Poland wind projects Level 3		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses U.S. wind projects Level 1		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses U.S. wind projects Level 2		Dec. 31, 2013 Fair Value Discontinued Operations and Held for Sale Businesses U.S. wind projects Level 3		Dec. 31, 2012 Fair Value Discontinued Operations and Held for Sale Businesses Tisza II Level 2		Dec. 31, 2013 Fair Value Equity Method Affiliate Level 1		Dec. 31, 2012 Fair Value Equity Method Affiliate Level 1	Dec. 31, 2013 Fair Value Equity Method Affiliate Level 2		Dec. 31, 2012 Fair Value Equity Method Affiliate Level 2		Dec. 31, 2013 Fair Value Equity Method Affiliate Level 3		Dec. 31, 2012 Fair Value Equity Method Affiliate Level 3	Dec. 31, 2012 Fair Value Goodwill DP&L Level 1	Dec. 31, 2012 Fair Value Goodwill DP&L Level 2	Dec. 31, 2013 Fair Value Goodwill DP&L Level 3		Dec. 31, 2012 Fair Value Goodwill DP&L Level 3	Dec. 31, 2013 Fair Value Goodwill Ebute Level 1		Dec. 31, 2013 Fair Value Goodwill Ebute Level 2		Dec. 31, 2013 Fair Value Goodwill Ebute Level 3		Dec. 31, 2013 Fair Value Goodwill MountainView Level 1		Dec. 31, 2013 Fair Value Goodwill MountainView Level 2		Dec. 31, 2013 Fair Value Goodwill MountainView Level 3
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]
Asset fair value nonrecurring				$ 7,000,000	$ 0					$ 22,000,000																																				$ 23,000,000	[1]	$ 61,000,000	[1]	$ 26,000,000	[1]	$ 29,000,000	[1]	$ 21,000,000	[1]	$ 25,000,000	[1]	$ 45,000,000	[1]	$ 33,000,000	[1]	$ 414,000,000	[2]	$ 19,000,000	[2]	$ 164,000,000	[2]	$ 79,000,000	[2]	$ 77,000,000	[2]	$ 105,000,000	[2]	$ 240,000,000	[3]	$ 205,000,000	[3]	$ 623,000,000	[3]	$ 2,440,000,000	$ 58,000,000	[3]	$ 7,000,000	[3]	$ 133,000,000	$ 0	[1]	$ 0	[1]	$ 7,000,000	[1]	$ 0	[1]	$ 0	[1]	$ 15,000,000	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 10,000,000	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 25,000,000	[1]	$ 0	[1]	$ 0	[1]	$ 25,000,000	[1]	$ 0	[1]	$ 22,000,000	[1]	$ 0	[1]	$ 0	[2]	$ 356,000,000	[2]	$ 0	[2]	$ 0	[2]	$ 7,000,000	[2]	$ 0	[2]	$ 0	[2]	$ 124,000,000	[2]	$ 0	[2]	$ 0	[2]	$ 14,000,000	[2]	$ 0	[2]	$ 0	[2]	$ 30,000,000	[2]	$ 0	[2]	$ 14,000,000	[2]	$ 0	[3]	$ 0	$ 0	[3]	$ 155,000,000	[3]	$ 111,000,000	[3]	$ 0	$ 0	$ 0	$ 316,000,000	[3]	$ 623,000,000	$ 0	[3]	$ 0	[3]	$ 0	[3]	$ 0	[3]	$ 0	[3]	$ 0	[3]
Asset impairment expense	661,000,000	1,940,000,000	366,000,000								16,000,000	46,000,000	26,000,000	19,000,000	[1]	21,000,000	[1]	0	[1]	20,000,000	[1]	11,000,000	[1]	63,000,000	[2]	12,000,000	[2]	44,000,000	[2]	65,000,000	[2]	47,000,000	[2]	91,000,000	[2]
Total other non-operating expense	129,000,000	50,000,000	82,000,000																																	129,000,000	50,000,000	[3]
Goodwill impairment expense	$ 372,000,000	$ 1,817,000,000	$ 17,000,000			$ 307,000,000	$ 1,820,000,000	$ 58,000,000	$ 7,000,000																														$ 307,000,000	[3]	$ 1,817,000,000	$ 58,000,000	[3]	$ 7,000,000	[3]

[1] See Note 21 — Asset Impairment Expense for further information.

[2] See Note 23 — Discontinued Operations and Held-For-Sale Businesses for further information. Also, the gross loss equals the carrying amount of the disposal group less its fair value less costs to sell.

[3] See Note 9 — Other Non-Operating Expense for further information.