Shareholders' Equity (Details - Accumulated Other Comprehensive Income (Loss)) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,	$ (99)	$ (249)
Other comprehensive income (loss), before reclassifications	94	28
Amounts reclassified from accumulated other comprehensive loss	(9)	10
Other comprehensive income (loss)	85	38
Ending balance,	(14)	(211)
Available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,	(101)	7
Other comprehensive income (loss), before reclassifications	94	39
Amounts reclassified from accumulated other comprehensive loss	(9)	(6)
Other comprehensive income (loss)	85	33
Ending balance,	(16)	40
Cash flow hedging instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,	0	(261)
Other comprehensive income (loss), before reclassifications	0	(11)
Amounts reclassified from accumulated other comprehensive loss	0	16
Other comprehensive income (loss)	0	5
Ending balance,	0	(256)
Foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,	2	5
Other comprehensive income (loss), before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Other comprehensive income (loss)	0	0
Ending balance,	$ 2	$ 5