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Commitments and Contingencies Level 4 - Derivative Commitments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Loss Contingencies [Line Items]  
Derivative, Net Liability Position, Aggregate Fair Value $ 539
Collateral Already Posted, Aggregate Fair Value 572
GMWB Product Derivatives [Member]  
Loss Contingencies [Line Items]  
Collateral Already Posted, Aggregate Fair Value $ 23