Collateral Financing Arrangements Collateral Financing Arrangements (Associated with Closed Block) (Details) - Met Life Reinsurance Company Of Charleston [Member] - Secured Debt [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt Instrument, Principal Outstanding	$ 993	$ 1,060
Other Receivables	130	139
Pledged Assets Separately Reported, Securities Pledged for Other Debt Obligations, at Fair Value	58	83
Invested Assets On Deposit Held In Trust And Pledged As Collateral	$ 1,390	$ 1,370