Shareholders' Equity (Details - Accumulated Other Comprehensive Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,	$ (249)	$ (453)	$ (310)
Other comprehensive income (loss), before reclassifications	(97)	154	(193)
Amounts reclassified from accumulated other comprehensive loss	247	50	50
Other comprehensive income (loss)	150	204	(143)
Ending balance,	(99)	(249)	(453)
Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,	7	(160)	137
Other comprehensive income (loss), before reclassifications	(84)	193	(260)
Amounts reclassified from accumulated other comprehensive loss	(24)	(26)	(37)
Other comprehensive income (loss)	(108)	167	(297)
Ending balance,	(101)	7	(160)
Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,	(261)	(298)	(452)
Other comprehensive income (loss), before reclassifications	(10)	(39)	67
Amounts reclassified from accumulated other comprehensive loss	271	76	87
Other comprehensive income (loss)	261	37	154
Ending balance,	0	(261)	(298)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,	5	5	5
Other comprehensive income (loss), before reclassifications	(3)	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Other comprehensive income (loss)	(3)	0	0
Ending balance,	$ 2	$ 5	$ 5