Reinsurance (Product information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reinsurance Retention Policy [Line Items]
Maximum amount of life policy risk retained by entity, net of reinsured amounts	$ 1,500,000
Life Insurance [Member]
Reinsurance Retention Policy [Line Items]
Percentage of risk reinsured	90.00%
Life Insurance In Force, Net [Abstract]
Traditional Life and UL insurance in force, gross	$ 195,100,000,000	$ 195,900,000,000
Traditional Life and UL insurance in force, reinsured	$ 142,400,000,000	$ 142,400,000,000
IUL and VUL
Reinsurance Retention Policy [Line Items]
Percentage of risk reinsured	50.00%
TrioSource UL insurance [Member]
Reinsurance Retention Policy [Line Items]
Percentage of risk reinsured	50.00%
Single Life Insurance [Member]
Reinsurance Retention Policy [Line Items]
Maximum amount of life insurance risk retained by the entity	$ 10,000,000
Flexible Premium Survivorship Life Insurance [Member]
Reinsurance Retention Policy [Line Items]
Maximum amount of life insurance risk retained by the entity	$ 10,000,000
LTC [Member]
Reinsurance Retention Policy [Line Items]
Percentage of risk reinsured	50.00%
DI [Member]
Reinsurance Retention Policy [Line Items]
Maximum amount of life insurance risk retained by the entity	$ 5,000
Property and casualty [Member]
Reinsurance Retention Policy [Line Items]
Auto and home reinsurance maximum recovery per loss by entity	5,000,000
Maximum amount of auto and home insurance risk retained by entity per loss	1,000,000
Catastrophe reinsurance loss recovery for first event by entity	200,000,000
Catastrophe reinsurance loss recovery for second event by entity	180,000,000
Maximum amount of catastrophe insurance risk retained by entity per event	$ 20,000,000
Percentage of personal umbrella, loss ceded	90.00%
Maximum personal umbrella, recovery	$ 5,000,000
Percentage of home insurance products. loss ceded	90.00%