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Insurance - Reinsurance information table including assumed, ceded, and recoveries (Details) - Property and casualty insurance - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effects of Reinsurance [Line Items]
Direct premiums written	$ 6,310	$ 5,858	$ 5,713
Reinsurance assumed	192	123	119
Reinsurance ceded	(1,751)	(1,595)	(1,505)
Net written premiums	4,751	4,386	4,327
Direct premiums earned	6,112	5,745	5,613
Reinsurance assumed	157	118	105
Reinsurance ceded	(1,690)	(1,535)	(1,494)
Net earned premiums	4,579	4,328	4,224
Reinsurance recoveries	$ 1,379	$ 810	$ 936

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