Consolidated Statements of Changes in Equity (USD $) In Millions, except Share data	Total	Common Stock	Additional Paid-in Capital [Member]	Retained Earnings	Accumulated Other Comprehensive Loss	Accumulated Defined Benefit Plans Adjustment [Member]	Accumulated Net Unrealized Investment Gain (Loss) [Member]
Beginning Balance at Dec. 31, 2010	$ 4,009	$ 1,386	$ 1,810	$ 829	$ (16)
Beginning Balance, shares at Dec. 31, 2010		138,632,000
Net Income	437			437
Dividends declared on common stock	(306)			(306)
Other Comprehensive Income (Loss), Net of Tax	(4)					(4)
Ending Balance at Dec. 31, 2011	4,136	1,386	1,810	960	(20)
Ending Balance, shares at Dec. 31, 2011		138,632,000
Net Income	486			486
Dividends declared on common stock	(317)			(317)
Other Comprehensive Income (Loss), Net of Tax	(2)					(2)
Ending Balance at Dec. 31, 2012	4,303	1,386	1,810	1,129	(22)
Ending Balance, shares at Dec. 31, 2012	138,632,324	138,632,000
Net Income	487			487
Dividends declared on common stock	(342)			(342)
Other Comprehensive Income (Loss), Net of Tax	6					5	1
Capital Contribution by Parent Company	400		400
Ending Balance at Dec. 31, 2013	$ 4,854	$ 1,386	$ 2,210	$ 1,274	$ (16)
Ending Balance, shares at Dec. 31, 2013	138,632,324	138,632,000