Fair Value Measurements (Details 4) - Level 3 - Fair Value, Measurements, Recurring - Discounted Cash Flow Valuation Technique $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2015 USD ($) bond	Dec. 31, 2014 USD ($) bond
Corporate debt
Unobservable Input
Yield (as a percent)	[1]	0.00%	1.05%
Number of bonds			1
Commercial mortgage-backed securities (“CMBS”)
Unobservable Input
Spread (as a percent)	[1],[2]		1.39%
Number of bonds			1
Residential mortgage-backed securities (“RMBS”)
Unobservable Input
Spread (as a percent)	[1]	7.43%	7.36%	[2]
Number of bonds		1	1
Debt Instrument, Fair Value Disclosure | $		$ 1	$ 1
Mortgage Loan Securitizations
Unobservable Input
Number of bonds			1

[1] At September 30, 2015 and December 31, 2014, RMBS consisted of one bond, which was less than $1 million. At December 31, 2014, corporate debt and CMBS also consisted of one bond.

[2] During the first quarter of 2015, we identified that we incorrectly disclosed the weighted average ranges of our RMBS bond and CMBS bond as of December 31, 2014. The weighted average ranges of these bonds at December 31, 2014 have been corrected in the table above.