Derivative Financial Instruments (Details 2) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Asset derivatives
Asset derivatives gross amount	$ 89	$ 63
Asset derivatives, gross liability	(21)	(2)
Derivative assets net amount on balance sheet	68	61
Liability derivatives
Liability derivatives gross amount	(357)	(329)
Liability derivatives, gross asset	6	6
Derivative liabilities net amount on balance sheet	(351)	(323)
OTC derivatives
Asset derivatives
Asset derivatives gross amount	8	21
Asset derivatives, gross liability	(27)	(8)
Derivative, collateral, right to reclaim cash	19
Derivative asset offsets under cash collateral received		(5)
Derivative assets net amount on balance sheet	0	8
Derivative assets pledged under securities collateral	3	(4)
Derivative asset, fair value, amount offset against collateral	3	4
Liability derivatives
Liability derivatives gross amount	(35)	(25)
Liability derivatives, gross asset	27	8
Derivative liability offsets under cash collateral pledged	(5)	(1)
Derivative liabilities net amount on balance sheet	(13)	(18)
Derivative liabilities received under securities collateral	10	9
Derivative liability, fair value, amount offset against collateral	$ (3)	$ (9)