Reinsurance and Indemnification - Life and annuity reinsurance recoverables (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) reinsurer
Reinsurance Retention Policy [Line Items]
Reinsurance recoverables | $	$ 70
Allstate Annuities
Reinsurance Retention Policy [Line Items]
Percent of morbidity risk ceded for term-life insurance policies	90.00%
Number of unaffiliated reinsurers | reinsurer	14