CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2012 Successor [Member]	Dec. 31, 2011 Predecessor [Member]
Current assets:
Cash and cash equivalents	$ 49	$ 24
Accounts receivable, net	155	271
Accounts receivable - affiliates	72	10
Inventories	163	204
Deferred natural gas purchases	0	51
Natural gas imbalances - receivable	11	55
Assets Held-for-sale, Current	184	0
Prepayments and other assets	120	43
Total current assets	754	658
Property, plant and equipment:
Plant in service	5,491	7,196
Construction work in progress	272	104
Property, plant and equipment, gross	5,763	7,300
Less: Accumulated depreciation and amortization	(105)	(1,573)
Net property, plant and equipment	5,658	5,727
Non-Current Assets Held for Sale	985	0
Deferred charges:
Regulatory assets	0	57
Other deferred charges	65	60
Total deferred charges	65	117
Unconsolidated investments	115	1,633
Goodwill	2,364	89
Other Non-Current Assets	52	47
Total assets	9,993	8,271
Current liabilities:
Current portion of long–term debt	259	343
Notes payable	0	200
Accounts payable and accrued liabilities	118	194
Accounts payable and accrued liabilities - related parties	110	0
Federal, state and local taxes payable	16	37
Accrued interest	32	34
Natural gas imbalances - payable	133	145
Derivative instruments	18	59
Current liabilities held for sale	85	0
Other	108	112
Total current liabilities	879	1,124
Long–term debt, less current maturities	3,024	3,160
Deferred credits	330	302
Deferred Income Taxes	1,590	1,045
Non-current liabilities held for sale	142	0
Commitments and contingencies
Stockholders equity:
Common stock	0	126
Premium on capital stock	4,079	1,934
Less: Treasury stock	0	(33)
Less: Common stock held in trust	0	(11)
Deferred compensation plans	0	11
Accumulated other comprehensive income (loss)	(25)	(119)
Retained earnings (accumulated deficit)	(26)	732
Total stockholders' equity	4,028	2,640
Total liabilities and stockholders' equity	$ 9,993	$ 8,271