Shareholders' Equity (Details - Reclassification Out Of Accumulated Other Comprehensive Loss) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest income									$ 2,009	$ 1,571	$ 1,233
Reclassification into earnings, net									1,418	1,064	838
Income tax (expense) benefit									(366)	(450)	(286)
Other Non-interest expense									(77)	(76)	(71)
Net income	$ 270	$ 285	$ 250	$ 247	$ 129	$ 147	$ 193	$ 145	1,052	614	552
Available-for-sale securities | Reclassification out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Gains on securities and other, net									45	39	53
Interest income									(3)	0	0
Reclassification into earnings, net									42	39	53
Income tax (expense) benefit									(11)	(15)	(20)
Net income									31	24	33
Foreign currency translation | Reclassification out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Non-interest expense									0	2	0
Net income									$ 0	$ 2	$ 0