Derivative Financial Instruments (Details 2) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Asset derivatives
Gross amount	$ 71	$ 57
Counter- party netting	0	(1)
Total asset derivatives	71	56
Liability derivatives
Gross amount	(334)	(313)
Counter- party netting	5	5
Total liability derivatives	(329)	(308)
OTC derivatives
Asset derivatives
Gross amount	8	15
Counter- party netting	(5)	(6)
Cash collateral (received) pledged	(2)	(5)
Total asset derivatives	1	4
Securities collateral (received) pledged	0	(1)
Net amount	1	3
Liability derivatives
Gross amount	(11)	(9)
Counter- party netting	5	6
Cash collateral (received) pledged	(4)	(5)
Total liability derivatives	(10)	(8)
Securities collateral (received) pledged	6	7
Net amount	$ (4)	$ (1)