Derivatives (Credit Risk on Freestanding Derivatives) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Credit Derivatives [Line Items]
Estimated fair value of derivatives in a net liability position (1)	$ 1,637	$ 1,595
Derivative, Collateral, Right to Reclaim Cash	111	126
Exchange Traded [Member]
Credit Derivatives [Line Items]
Derivative, Collateral, Right to Reclaim Securities	185	185
Fixed maturity securities AFS
Credit Derivatives [Line Items]
Estimated fair value of collateral provided:	2,069	1,591
Derivatives Subject to Credit- Contingent Provisions
Credit Derivatives [Line Items]
Estimated fair value of derivatives in a net liability position (1)	1,624	1,386
Derivatives Subject to Credit- Contingent Provisions | Fixed maturity securities AFS
Credit Derivatives [Line Items]
Estimated fair value of collateral provided:	2,057	1,370
Derivatives Not Subject to Credit- Contingent Provisions
Credit Derivatives [Line Items]
Estimated fair value of derivatives in a net liability position (1)	13	209
Derivatives Not Subject to Credit- Contingent Provisions | Fixed maturity securities AFS
Credit Derivatives [Line Items]
Estimated fair value of collateral provided:	$ 12	$ 221