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, 2011	$ 4,136	$ 1,386	$ 1,810	$ 960	$ (20)
Beginning Balance, shares at Dec. 31, 2011	138,632,324	138,632,000
Net income	419			419
Dividends declared on common stock	(228)			(228)
Benefit obligations, net of tax	2				2
Ending Balance at Sep. 30, 2012	$ 4,329	$ 1,386	$ 1,810	$ 1,151	$ (18)
Ending Balance, shares at Sep. 30, 2012	138,632,324	138,632,000