Nature of Operations and Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Product Information [Line Items]
Number of wholly owned subsidiaries	2
Loans Reported As Delinquent In Days	60 days
Period In Which Loans No Longer Accrue Interest In Days	90 days
Estimated Contract Life UL Policies (In Years)	40 years
Estimated Contract Life VUL Policies (In Years)	40 years
Front End Load Annuity Products Assumed Life (In Years)	25 years
Useful Life of Sales Force Intangible Assets (In Years)	25 years
Number Of Scenarios Used Per Policy To Value A Block Of Guarantees	100
Total Scenarios To Value GLB liability	49,000,000
Participating Policies as a Percentage of the Face Amount of the Insurance In Force	1.00%	1.00%
Dividend Expenses | $	$ 56	$ 57	$ 59
Maximum [Member]
Product Information [Line Items]
Estimated Contract Life Fixed and Variable Deferred Annuities (In Years)	30 years
Traditional Contract Acquisition Cost Amortization Period (In Years)	30 years
Interest Crediting Rate	10.00%	10.00%	10.00%
Minimum [Member]
Product Information [Line Items]
Estimated Contract Life Fixed and Variable Deferred Annuities (In Years)	15 years
Interest Crediting Rate	1.00%	1.00%	1.00%
Life Insurance Segment [Member] | Maximum [Member]
Product Information [Line Items]
Investment Yield Assumptions for Traditional Direct Individual Life Reserves	7.75%
Life Insurance Segment [Member] | Minimum [Member]
Product Information [Line Items]
Investment Yield Assumptions for Traditional Direct Individual Life Reserves	2.25%
Annuities Segment [Member] | Maximum [Member]
Product Information [Line Items]
Investment Yield Assumptions for Immediate and Deferred Paid-Up Annuities	12.75%
Annuities Segment [Member] | Minimum [Member]
Product Information [Line Items]
Investment Yield Assumptions for Immediate and Deferred Paid-Up Annuities	1.25%
Reinsurance Transactions, 2012 to 2014 [Member]
Product Information [Line Items]
No. of Years in Which Deferred Gain From Reinsurance Transaction is Recognized as Income	30 years
Reinsurance Transactions, Athene [Member]
Product Information [Line Items]
No. of Years in Which Deferred Gain From Reinsurance Transaction is Recognized as Income	20 years
Reinsurance Transactions, 2012 to 2013 [Member]
Product Information [Line Items]
No. of Years in Which Deferred Gain From Reinsurance Transaction is Recognized as Income	30 years
Reinsurance Transactions, First Penn-Pacific Life Insurance [Member]
Product Information [Line Items]
No. of Years in Which Deferred Gain From Reinsurance Transaction is Recognized as Income	15 years