Shareholders' Equity (Details - Shareholders' Equity Activity) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance,				$ 5,375				$ 4,856	$ 5,375	$ 4,856	$ 4,904
Net income	$ 89	$ (153)	$ 292	40	$ 41	$ 86	$ 69	$ 97	268	293	86
Net change from available-for-sale securities									(108)
Net change from cash flow hedging instruments									261
Other									3
Balance,	5,799				5,375				5,799	5,375	$ 4,856
Common Stock and Additional Paid in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance,				7,353					7,353
Net income									0
Net change from available-for-sale securities									0
Net change from cash flow hedging instruments									0
Other									6
Balance,	7,359				7,353				7,359	7,353
Accumulated Deficit and Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance,				$ (1,978)					(1,978)
Net income									268
Net change from available-for-sale securities									(108)
Net change from cash flow hedging instruments									261
Other									(3)
Balance,	$ (1,560)				$ (1,978)				$ (1,560)	$ (1,978)