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Commitments and Contingencies Level 4 (Details)
$ in Millions
Jun. 30, 2016
USD ($)
Derivative Commitments [Line Items]  
Derivative, Net Liability Position, Aggregate Fair Value $ 1,300
Collateral Already Posted, Aggregate Fair Value 1,600
GMWB Product Derivatives [Member]  
Derivative Commitments [Line Items]  
Collateral Already Posted, Aggregate Fair Value $ 31