Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Millions, except Share data	Total	Common Stock	Additional Paid-in Capital [Member]	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2012	$ 4,303	$ 1,386	$ 1,810	$ 1,129	$ (22)
Beginning Balance, shares at Dec. 31, 2012	138,632,324	138,632,000
Net Income	206			206
Dividends declared on common stock	(171)			(171)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1				1
Ending Balance at Jun. 30, 2013	$ 4,339	$ 1,386	$ 1,810	$ 1,164	$ (21)
Ending Balance, shares at Jun. 30, 2013	138,632,324	138,632,000