Derivative Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014 party	Dec. 31, 2013 party
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash and securities pledged as collateral by counterparties	$ 3
Securities pledged as collateral to counterparties	14
Collateral posted under MNAs for contracts without credit-risk-contingent liabilities	9
Credit Derivatives
Number of counter-parties (in Party)	7,000,000	0
Notional amount	194	1,648
Credit exposure	7	5
Exposure, net of collateral	4	1
Gross liability fair value of contracts containing credit-risk-contingent features	10	25
Gross asset fair value of contracts containing credit-risk-contingent features and subject to MNAs	(3)	(9)
Collateral posted under MNAs for contracts containing credit-risk-contingent features	(5)	(14)
Maximum amount of additional exposure for contracts with credit-risk-contingent features if all features were triggered concurrently	2	2
A+
Credit Derivatives
Number of counter-parties (in Party)	1,000,000	0
Notional amount	16	22
Credit exposure	0	1
Exposure, net of collateral	0	1
A
Credit Derivatives
Number of counter-parties (in Party)	3,000,000	0
Notional amount	97	1,523
Credit exposure	6	2
Exposure, net of collateral	3	0
A-
Credit Derivatives
Number of counter-parties (in Party)	1,000,000	0
Notional amount	8	24
Credit exposure	1	1
Exposure, net of collateral	1	0
BBB+
Credit Derivatives
Number of counter-parties (in Party)	1,000,000	0
Notional amount	11	3
Credit exposure	0	0
Exposure, net of collateral	0	0
BBB
Credit Derivatives
Number of counter-parties (in Party)	1,000,000	0
Notional amount	62	76
Credit exposure	0	1
Exposure, net of collateral	$ 0	$ 0