CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2012 Successor	Mar. 25, 2012 Predecessor	Dec. 31, 2011 Predecessor	Dec. 31, 2010 Predecessor
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 88	$ 40	$ 168	$ 148
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	125	30	128	123
Deferred income taxes	86	19	76	52
Amortization of costs charged to interest	(24)	0	0	0
Net gain on curtailment of OPEB benefits	(11)	0	0	0
Changes in operating assets and liabilities, net of Merger impact	(77)	23	(28)	(21)
Net cash flows provided by operating activities	187	112	344	302
CASH FLOWS FROM INVESTING ACTIVITIES:
Net (increase) decrease in note receivable - related parties	(55)	255	(207)	(128)
Net (decrease) increase in income taxes payable - related parties	(43)	5	(10)	21
Additions to property, plant and equipment	(90)	(28)	(111)	(161)
Plant retirements and other	0	0	0	7
Net cash flows (used in) provided by investing activities	(188)	232	(328)	(261)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of long-term debt	0	455	0	0
Repayment of debt	0	(797)	(18)	(41)
Issuance costs of debt	0	(2)	0	0
Other	1	0	2	0
Net cash flows provided by (used in) financing activities	1	(344)	(16)	(41)
INCREASE IN CASH AND CASH EQUIVALENTS	0	0	0	0
CASH AND CASH EQUIVALENTS, beginning of period	0	0	0	0
CASH AND CASH EQUIVALENTS, end of period	$ 0	$ 0	$ 0	$ 0