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Commitments, Guarantees and Contingencies Loss Contingencies (Details 3)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Insurance-related Assessments [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability $ 12
Loss contingency for guaranty fund assessments premium tax asset offset $ 10
Minimum [Member]  
Loss Contingencies [Line Items]  
Minimum interest rate guarantees in fixed accounts 1.00%
Maximum [Member]  
Loss Contingencies [Line Items]  
Minimum interest rate guarantees in fixed accounts 5.00%