Derivative Financial Instruments (Details 2) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Asset derivatives
Asset derivatives gross amount	$ 80	$ 63
Asset derivatives, gross liability	(25)	(2)
Derivative assets net amount on balance sheet	55	61
Liability derivatives
Liability derivatives gross amount	(345)	(329)
Liability derivatives, gross asset	12	6
Derivative liabilities net amount on balance sheet	(333)	(323)
OTC derivatives
Asset derivatives
Asset derivatives gross amount	22	21
Asset derivatives, gross liability	(37)	(8)
Derivative, collateral, right to reclaim cash	19
Derivative asset offsets under cash collateral received		(5)
Derivative assets net amount on balance sheet	4	8
Derivative assets pledged under securities collateral	0	(4)
Derivative asset, fair value, amount offset against collateral	4	4
Liability derivatives
Liability derivatives gross amount	(45)	(25)
Liability derivatives, gross asset	37	8
Derivative liability offsets under cash collateral pledged	(4)	(1)
Derivative liabilities net amount on balance sheet	(12)	(18)
Derivative liabilities received under securities collateral	9	9
Derivative liability, fair value, amount offset against collateral	$ (3)	$ (9)