Shareholders' Equity (Details - Reclassification Out Of Accumulated Other Comprehensive Income (Loss)) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) on securities and other	$ 10	$ 15
Interest expense	(21)	(66)
Income tax (expense) benefit	(41)	(23)
Net income	153	40
Available-for-sale securities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) on securities and other	15	10
Income tax (expense) benefit	(6)	(4)
Net income	9	6
Cash flow hedging instruments | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	0	(26)
Income tax (expense) benefit	0	10
Net income	$ 0	$ (16)