Derivatives (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Indexed annuities as a percentage of annuity benefits	50.00%
Carrying value of collateral received to support purchased call options	$ 248
Interest rate swaptions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of pay-fixed interest rate swaptions	400
Payments to purchase swaptions	11
Not Designated as Hedging Instrument [Member] | Annuity benefits [Member] | Fixed-indexed annuities (embedded derivative) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
The portion of the change in fair value of the embedded derivative related to unlocking of actuarial assumptions	$ 2	$ 36