CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (USD $) In Millions, unless otherwise specified	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2012	$ 24,129	$ 0	$ 6	$ 18,589	$ 5,846	$ (312)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent	(145)				(145)
Dividends to parent — exchange transactions	(666)				(666)
Net income (loss)	(3,578)				(3,578)
Other comprehensive loss	(327)					(327)
Total comprehensive income (loss)	(3,905)				(3,578)	(327)
Ending balance at Sep. 30, 2013	19,413	0	6	18,589	1,457	(639)
Beginning balance at Dec. 31, 2013	19,196	0	6	18,603	1,235	(648)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend to parent	(85)				(85)
Dividends to parent — exchange transactions	(666)				(666)
Share-based compensation plans	57			57
Net income (loss)	668				668
Other comprehensive loss	213					213
Total comprehensive income (loss)	881				668	213
Ending balance at Sep. 30, 2014	$ 19,383	$ 0	$ 6	$ 18,660	$ 1,152	$ (435)