Contracts Accounted for as Insurance - Selected Information for Policies Paid In Installments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014	[1]	Dec. 31, 2013
Financial Guarantee Insurance Premiums [Line Items]
Premiums receivable, net of commission payable	$ 576	[1]	$ 693	[1]	$ 729		$ 876
Financial Guarantee Policies Paid in Installments [Member]
Financial Guarantee Insurance Premiums [Line Items]
Premiums receivable, net of commission payable	576		693
Gross deferred premium revenue	$ 1,041		$ 1,240
Weighted-average risk-free rate used to discount premiums (as a percent)	3.00%		3.10%
Weighted-average period of premiums receivable (in years)	9 years 1 month 24 days		9 years 4 months 24 days

[1] (1)Excludes $11 million, $17 million and $19 million as of December 31, 2016 , 2015 and 2014, respectively, related to consolidated FG VIEs.