Fair Value - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair value, assets, level 2 to level 1, transfers	$ 0	$ 0
Fair value, assets, level 1 to level 2, transfers	0	$ 0
Other invested assets overseas deposit	35,000,000		$ 31,000,000
Life settlement contracts, fair value	$ 46,000,000		$ 58,000,000