Accounting for Derivative Instruments and Hedging Activities (Details - Fair Value of Derivatives) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2,204	$ 3,069
Derivative Asset	10	24
Derivative Liability	(55)	(66)
Derivative Asset (Liability), Net	(45)	(42)
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	0	2,000
Derivative Asset	0	23
Derivative Liability	0	(24)
Derivative Asset (Liability), Net	0	(1)
Fair Value Hedging [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,204	1,069
Derivative Asset	10	1
Derivative Liability	(55)	(42)
Derivative Asset (Liability), Net	$ (45)	$ (41)