Reinsurance (Narrative) (Details) $ in Millions			12 Months Ended
	Apr. 01, 2015	Jan. 02, 2013 USD ($) policy	Dec. 31, 2016 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2019 company
Effects of Reinsurance [Line Items]
Number of major reinsurance companies | company						4
Percentage Of Reinsurance Recoverable From Major Reinsurance Companies						60.00%
Domestic Business, per Life
Effects of Reinsurance [Line Items]
Reinsurance retention policy, amount retained				$ 20	$ 30
Hartford Life Business
Effects of Reinsurance [Line Items]
Reinsurance retention policy, amount retained		$ 141,000
Business acquisition number of life insurance policies acquired reinsurance | policy		700,000
Quote Share Reinsurance | Union Hamilton
Effects of Reinsurance [Line Items]
Reinsurance retention policy, reinsured risk percentage	50.00%
Reinsurance retention policy, amount retained			$ 2,900