Nature Of Operations, Basis Of Presentation And Summary Of Significant Accounting Policies (Details) item in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Product Information [Line Items]
Loans Reported As Delinquent In Days	60 days
Period In Which Loans No Longer Accrue Interest In Days	90 days
Loan-to-value ratio indicating principal is greater than collateral	100.00%
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
Number Of Scenarios Used Per Policy To Value A Block Of Guarantees	100
Total Scenarios To Value GLB liability | item	49
Dividend Expenses | $	$ 56	$ 57	$ 59
No. of Years in Which Deferred Gain From Reinsurance Transaction is Recognized as Income	20 years
Sales Force Intangibles [Member]
Product Information [Line Items]
Useful Life of Intangible Assets (In Years)	25 years
Maximum [Member]
Product Information [Line Items]
Debt-service coverage ratio indicating property income not covering debt payments	1.00%
Estimated Contract Life Fixed and Variable Deferred Annuities (In Years)	30 years
Traditional Contract Acquisition Cost Amortization Period (In Years)	30 years
Participating Policies as a Percentage of the Face Amount of the Insurance In Force	1.00%	1.00%
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%