Derivative Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Asset derivatives
Asset derivatives gross amount	$ 74	$ 266
Total asset derivatives, Fair value, net	74	254
Liability derivatives
Liability derivatives gross amount	(357)	(752)
Derivative liabilities net amount on balance sheet	(352)	(741)
OTC derivatives
Asset derivatives
Asset derivatives gross amount	12	14
Offsets of derivative assets under counterparty netting	(5)	(11)
Derivative asset offsets under cash collateral received	0	0
Total asset derivatives, Fair value, net	7	3
Derivative assets pledged under securities collateral	(2)	(3)
Derivative assets net amount	5	0
Liability derivatives
Liability derivatives gross amount	(16)	(33)
Offsets of derivative liabilities under counterparty netting	5	11
Derivative liability offsets under cash collateral pledged	0	(4)
Derivative liabilities net amount on balance sheet	(11)	(26)
Derivative liabilities received under securities collateral	13	22
Derivative liabilities net amount	$ 2	$ (4)