Shareholders' Equity (Details - Other Comprehensive Income Activity) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Available-for-sale securities, before tax
Unrealized gains (losses), before tax	$ 68		$ 112		$ 144	$ 264
Reclassification into earnings, before tax	(10)		(14)		(18)	(29)
Net change from available-for-sale securities, before tax	58		98		126	235
Foreign currency translation, before tax
Reclassification of foreign currency translation gains, before tax					(2)	0
Available-for-sale securities, tax effect
Unrealized gains (losses), tax effect	(26)		(43)		(56)	(101)
Reclassification into earnings, tax effect	4		5		7	11
Net change from available-for-sale securities, tax effect	(22)		(38)		(49)	(90)
Foreign currency translation, tax effect
Reclassification of foreign currency translation gains, tax effect					0	0
Available-for-sale securities, after tax
Unrealized gains (losses), after tax	42		69		88	163
Reclassification into earnings, after tax	(6)		(9)		(11)	(18)
Net change from available-for-sale securities	36		60		77	145
Foreign currency translation, after tax
Reclassification of foreign currency translation gains, after tax	0		0		(2)	0
Other comprehensive income (loss), before tax	58		98		124	235
Other comprehensive income (loss), tax effect	(22)		(38)		(49)	(90)
Other comprehensive income (loss)	$ 36	$ 39	$ 60	$ 85	$ 75	$ 145