Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Millions, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Defined Benefit Plans Adjustment [Member]
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	386			386
Dividends declared on common stock	(257)			(257)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	2					2
Ending Balance at Sep. 30, 2013	$ 4,434	$ 1,386	$ 1,810	$ 1,258	$ (20)
Ending Balance, shares at Sep. 30, 2013	138,632,324	138,632,000