The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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Derivative Instrument and Hedging Activities - Derivative Effects on Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended	3 Months Ended				6 Months Ended	3 Months Ended				6 Months Ended	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2012 Successor [Member]	Jun. 30, 2013 Successor [Member]	Mar. 25, 2012 Predecessor [Member]	Jun. 30, 2013 Gains (Losses) On Non-Hedged Interest Rate Derivatives [Member] Interest Rate Derivatives [Member]	Jun. 30, 2012 Gains (Losses) On Non-Hedged Interest Rate Derivatives [Member] Interest Rate Derivatives [Member]	Jun. 30, 2012 Gains (Losses) On Non-Hedged Interest Rate Derivatives [Member] Interest Rate Derivatives [Member] Successor [Member]	Jun. 30, 2013 Gains (Losses) On Non-Hedged Interest Rate Derivatives [Member] Interest Rate Derivatives [Member] Successor [Member]	Mar. 25, 2012 Gains (Losses) On Non-Hedged Interest Rate Derivatives [Member] Interest Rate Derivatives [Member] Predecessor [Member]	Jun. 30, 2013 Deferred Gas Purchases [Member] Commodity [Member]	Jun. 30, 2012 Deferred Gas Purchases [Member] Commodity [Member]	Jun. 30, 2012 Deferred Gas Purchases [Member] Commodity [Member] Successor [Member]	Jun. 30, 2013 Deferred Gas Purchases [Member] Commodity [Member] Successor [Member]	Mar. 25, 2012 Deferred Gas Purchases [Member] Commodity [Member] Predecessor [Member]
Cash Flow Hedges: Interest rate contracts:
Change in fair value - increase in Accumulated other comprehensive income			$ 0	$ 0	$ 6
Reclassification of unrealized loss from Accumulated other comprehensive income - increase of Interest expense			0	0	8
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(3)	9	11	(3)	5
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	6	6	0	2
Economic Hedges: Interest rate contracts: [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Income, Net						$ (23)	$ 20	$ 20	$ (28)	$ 0	$ 10	$ (20)	$ (20)	$ (3)	$ (2)