Other Income and Expense - Other Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Other Income and Expenses [Abstract]
Contract termination (Beaver Valley)	$ 0	$ 0	$ 0		$ 60
Contingency reversal (Kazakhstan)	0	10	18	[1]	10
Gain on sale of assets	3	2	13		9
Other	9	13	25		27
Total other income	$ 12	$ 25	$ 56		$ 106

[1] (1) Reversal of a liability in Kazakhstan from the expiration of a statute of limitations for the Republic of Kazakhstan to claim payment from AES.