Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements of Cash Flows (Unaudited) [Abstract]
Cash Flows Used in Operating Activities	$ (20)	$ (11)
Cash Flows from Investing Activities:
Capital expenditures	(13)	(15)
Proceeds from disposal of property and other assets	1	6
Deposits into Capital Construction Fund	(2)	(2)
Withdrawals from Capital Construction Fund	2	2
Increase in investments	(7)	(9)
Reduction in investments	0	8
Net cash used in investing activities	(19)	(10)
Cash Flows from Financing Activities:
Proceeds from issuance of debt	51	102
Payments of debt and deferred financing costs	(15)	(65)
Proceeds from (payments on) line-of-credit agreements, net	1	(5)
Proceeds from issuances of capital stock and other	12	5
Dividends paid	(13)	(13)
Net cash provided by financing activities	36	24
Net Increase (Decrease) in Cash and Cash Equivalents	(3)	3
Other Cash Flow Information:
Interest paid	(7)	(8)
Income taxes paid	(1)	0
Other Non-cash Information:
Depreciation and amortization expense	27	27
Tax-deferred property sales	$ 9	$ 14