CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Mar. 31, 2011 Predecessor	Dec. 31, 2010 Predecessor
OPERATING ACTIVITIES
Net income (loss)	$ 19	$ 308	$ 211	$ (55)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,394	2,948	533	2,200
Deferred income taxes	27	174	145	508
Provision for uncollectible accounts	62	94	19	86
Long-term debt (premium) discount amortization	(150)	(84)	6	71
Loss on embedded option in convertible debt				475
Net loss on early retirement of debt	8	23		45
Stock-based compensation			4	93
Changes in current assets and liabilities:
Accounts receivable	(85)	(52)	61	(35)
Accounts payable	(99)	(112)	(71)	44
Accounts receivable and payable-affiliates, net	51	(307)
Accrued income and other taxes	(44)	(12)	31	(6)
Other current assets and other current liabilities, net	(3)	(85)	(117)	(12)
Changes in other noncurrent assets-affiliates		(4)
Changes in other noncurrent assets and liabilities	(42)	(90)	(53)	(68)
Other, net	14	5	8	21
Net cash provided by operating activities	2,152	2,806	777	3,367
INVESTING ACTIVITIES
Payments for property, plant and equipment and capitalized software	(1,207)	(1,589)	(410)	(1,488)
Changes in advances to affiliates	(663)	242
Proceeds from sale of property or maturities of investment securities		133		943
Purchases of investment securities				(944)
Other, net	2		2	1
Net cash used in investing activities	(1,868)	(1,214)	(408)	(1,488)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	2,126	896		775
Payments of long-term debt	(2,402)	(3,335)	(203)	(3,379)
Early retirement of debt costs	(66)	(200)		(41)
Dividends paid	(300)	(750)	(141)	(555)
Changes in notes payable-affiliate		2,023
Changes in accounts payable-affiliates		(187)
Net proceeds from issuance of common stock			14	67
Purchases of treasury stock				(136)
Settlement of embedded option in convertible debt				(640)
Other, net	(18)		13	(4)
Net cash used in financing activities	(660)	(1,553)	(317)	(3,913)
Net (decrease) increase in cash and cash equivalents	(376)	39	52	(2,034)
Cash and cash equivalents at beginning of period		48	372	2,406
Cash and cash equivalents at end of period	48	87	424	372
Supplemental cash flow information:
Income taxes (paid) refunded, net	13	(2)	1	(25)
Interest (paid) (net of capitalized interest of $26, $12, $5 and $18)	$ (659)	$ (836)	$ (236)	$ (989)