Goodwill and Other Intangibles (Details Textual) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill acquired during period		$ 16		$ 16
Goodwill decrease due to the sale of a subsidiary	$ (2)		$ (2)
Amortizable intangible assets related to property and casualty insurance acquisitions	41		41	49
Accumulated amortization	18		18	91
Amortization of intangible assets			$ 8	$ 19	$ 14
Weighted average useful life of finite-lived intangible assets acquired			5 years
Future amortization of intangibles in next year	8		$ 8
Future amortization of intangibles in year two	8		8
Future amortization of intangibles in year three	8		8
Future amortization of intangibles in year four	8		8
Future amortization of intangibles in year five	8		8
Future amortization of intangibles after year five	$ 1		$ 1