Consolidated Statements of Changes in Shareholder's Equity (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock	Other Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss, Net
Balance, Period Start at Dec. 31, 2011	$ 2,849	$ 0	$ 2,308	$ 545	$ (4)
Balance (shares), Period Start at Dec. 31, 2011		1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	258			258
Dividends declared	184			(184)
Other	(1)				(1)
Balance, Period End at Dec. 31, 2012	2,922	0	2,308	619	(5)
Balance (shares), Period End at Dec. 31, 2012		1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	145			145
Dividends declared	(178)			(178)
Other	1				1
Balance, Period End at Dec. 31, 2013	2,890	0	2,308	586	(4)
Balance (shares), Period End at Dec. 31, 2013	1,000	1,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	227			227
Dividends declared	(230)			(230)
Other	1				1
Balance, Period End at Dec. 31, 2014	$ 2,888	$ 0	$ 2,308	$ 583	$ (3)
Balance (shares), Period End at Dec. 31, 2014	1,000	1,000