CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Revenues
Wholesale energy	$ 2,828	$ 2,653	$ 2,890
Wholesale energy to affiliate	14	84	51
Retail energy	1,095	1,243	1,027
Energy-related businesses	544	601	527
Total Operating Revenues	4,481	4,581	4,495
Operation
Fuel	1,194	1,196	1,048
Energy purchases	676	1,054	1,153
Operation and maintenance	1,052	1,007	961
Loss on lease termination	0	0	697
Impairments	657	0	65
Depreciation	356	297	299
Taxes, other than income	65	57	53
Energy-related businesses	520	573	512
Total Operating Expenses	4,520	4,184	4,788
Operating Income (Loss)	(39)	397	(293)
Other Income (Expense) - net	(118)	30	32
Interest Expense	211	124	159
Income (Loss) from Continuing Operations Before Income Taxes	(368)	303	(420)
Income Taxes	(27)	116	(159)
Income (Loss) from Continuing Operations After Income Taxes	(341)	187	(261)
Income (Loss) from Discontinued Operations (net of income taxes)	0	223	32
Net Income (Loss)	(341)	410	(229)
Net Income (Loss) Attributable to Noncontrolling Interests	0	0	1
Net Income (Loss) Attributable to Member	(341)	410	(230)
Amounts Attributable to Member:
Income (Loss) from Continuing Operations After Income Taxes	(341)	187	(262)
Income (Loss) from Discontinued Operations (net of income taxes)	$ 0	$ 223	$ 32
Earnings Per Share of Common Stock - Basic:
Income (Loss) from continuing operations after income taxes (in dollars per share)	$ (3.10)	$ 2.24	$ (3.13)
Income (Loss) from discontinued operations (net of income taxes) (in dollars per share)	0.00	2.67	0.38
Net Income (Loss) (in dollars per share)	(3.10)	4.91	(2.75)
Earnings Per Share of Common Stock - Diluted:
Income (Loss) from continuing operations (in dollars per share)	(3.10)	2.24	(3.13)
Income (Loss) from discontinued operations (net of income taxes) (in dollars per share)	0.00	2.67	0.38
Net Income (Loss) (in dollars per share)	$ (3.10)	$ 4.91	$ (2.75)
Weighted-Average Shares of Common Stock Outstanding (in thousands)
Basic (in shares)	109,898	83,524	83,524
Diluted (in shares)	109,898	83,524	83,524
Talen Energy Supply
Operating Revenues
Wholesale energy	$ 2,828	$ 2,653	$ 2,890
Wholesale energy to affiliate	14	84	51
Retail energy	1,095	1,243	1,027
Energy-related businesses	544	601	527
Total Operating Revenues	4,481	4,581	4,495
Operation
Fuel	1,194	1,196	1,048
Energy purchases	676	1,054	1,153
Operation and maintenance	1,052	1,007	961
Loss on lease termination	0	0	697
Impairments	657	0	65
Depreciation	356	297	299
Taxes, other than income	65	57	53
Energy-related businesses	520	573	512
Total Operating Expenses	4,520	4,184	4,788
Operating Income (Loss)	(39)	397	(293)
Other Income (Expense) - net	(118)	30	32
Interest Expense	211	124	159
Income (Loss) from Continuing Operations Before Income Taxes	(368)	303	(420)
Income Taxes	(27)	116	(159)
Income (Loss) from Continuing Operations After Income Taxes	(341)	187	(261)
Income (Loss) from Discontinued Operations (net of income taxes)	0	223	32
Net Income (Loss)	(341)	410	(229)
Net Income (Loss) Attributable to Noncontrolling Interests	0	0	1
Net Income (Loss) Attributable to Member	(341)	410	(230)
Amounts Attributable to Member:
Income (Loss) from Continuing Operations After Income Taxes	(341)	187	(262)
Income (Loss) from Discontinued Operations (net of income taxes)	$ 0	$ 223	$ 32