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	Stockholders' Equity, Total [Member]
Beginning Balance at Dec. 31, 2011	$ 4,136	$ 1,386	$ 1,810	$ 960	$ (20)	$ 4,136
Beginning Balance, shares at Dec. 31, 2011	138,632,324	138,632,000
Net income				224		224
Dividends declared on common stock	(152)			(152)
Benefit obligations, net of tax	2				2	2
Ending Balance at Jun. 30, 2012	$ 4,210	$ 1,386	$ 1,810	$ 1,032	$ (18)	$ 4,210
Ending Balance, shares at Jun. 30, 2012	138,632,324	138,632,000