Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities
Net income	$ 69	$ 83	$ 128
Adjustments to reconcile net income to net cash from operating activities
Depreciation and amortization	92	88	83
Deferred income tax expense (benefit)	21	26	(3)
Other non-cash income items	13	22	(6)
Asset and liability changes
Accounts receivable	9	50	10
Change in deferred purchase price from accounts receivable sales	(8)	(13)	0
Accounts payable	(20)	(21)	55
Income taxes payable	(3)	(66)	12
Other asset changes	14	(20)	(59)
Other liability changes	34	(98)	88
Net cash provided by operating activities	221	51	308
Cash flows from investing activities
Capital expenditures	(88)	(80)	(116)
Net change in note receivable from affiliate	(37)	152	(3)
Proceeds from sale of assets	0	4	14
Other	7	2	(3)
Net cash provided by (used in) investing activities	(118)	78	(108)
Cash flows from financing activities
Payments to retire long-term debt	0	(54)	0
Dividends paid to parent, net of contribution	(103)	(75)	(200)
Net cash used in financing activities	(103)	(129)	(200)
Net change in cash and cash equivalents	0	0	0
Cash and cash equivalents
Beginning of period	0	0	0
End of period	0	0	0
Supplemental cash flow information
Interest paid, net of amounts capitalized	83	87	88
Income tax payments	$ 23	$ 87	$ 71