Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property-liability insurance premiums earned	$ 1,383	$ 1,407	$ 1,306
Property and casualty insurance claims and claims expense
Reinsurance ceded amount	530	524	1,378
Life contract benefits
Reinsurance ceded amount	155	165	240
Interest credited to contractholder funds
Reinsurance ceded amount	27	20	24
Property and casualty insurance premiums
Property-liability insurance premiums earned	1,141	1,122	1,016
Reinsurance ceded
Life and annuity premiums and contract charges	$ 242	$ 285	$ 290