Transactions With Affiliates (Balance Sheet Transactions With Affiliates) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Assets	$ 336,016	$ 299,145
Liabilities	314,431	282,826
Accrued Inter-Company Interest [Member] | Accrued Investment Income [Member]
Related Party Transaction [Line Items]
Assets	6	11
Accrued Inter-Company Interest [Member] | Other Liabilities [Member]
Related Party Transaction [Line Items]
Liabilities	5	13
Ceded Reinsurance Contracts [Member] | Deferred Acquisition Costs And Value Of Business Acquired [Member]
Related Party Transaction [Line Items]
Assets	(115)	(188)
Ceded Reinsurance Contracts [Member] | Reinsurance Recoverables [Member]
Related Party Transaction [Line Items]
Assets	2,473	2,574
Ceded Reinsurance Contracts [Member] | Reinsurance Related Embedded Derivatives [Member]
Related Party Transaction [Line Items]
Assets		191
Liabilities	46
Ceded Reinsurance Contracts [Member] | Other Assets [Member]
Related Party Transaction [Line Items]
Assets	228	235
Ceded Reinsurance Contracts [Member] | Other Liabilities [Member]
Related Party Transaction [Line Items]
Liabilities	497	325
Ceded Reinsurance Contracts [Member] | Other Contract Holder Funds [Member]
Related Party Transaction [Line Items]
Liabilities	(38)	(46)
Ceded Reinsurance Contracts [Member] | Funds Withheld Reinsurance Liabilities [Member]
Related Party Transaction [Line Items]
Liabilities	3,757	3,120
Cash Management Agreement [Member] | Other Assets [Member]
Related Party Transaction [Line Items]
Assets	1,227	112
Service Agreement [Member] | Other Assets [Member]
Related Party Transaction [Line Items]
Assets	6	5
Service Agreement [Member] | Other Liabilities [Member]
Related Party Transaction [Line Items]
Liabilities	22	56
Assumed Reinsurance Contracts [Member] | Future Contract Benefits [Member]
Related Party Transaction [Line Items]
Liabilities	26	29
Assumed Reinsurance Contracts [Member] | Other Contract Holder Funds [Member]
Related Party Transaction [Line Items]
Liabilities	390	400
Inter-Company Debt [Member] | Fixed Maturity Securities [Member]
Related Party Transaction [Line Items]
Assets	1,557	1,512
Inter-Company Debt [Member] | Short-term Debt [Member]
Related Party Transaction [Line Items]
Liabilities	609	288
Inter-Company Debt [Member] | Long-term Debt [Member]
Related Party Transaction [Line Items]
Liabilities	$ 2,414	$ 2,401