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DAC, VOBA, DSI, and DFEL (Estimated Future Amortization of VOBA) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Estimated future amortization of VOBA, net of interest [Abstract]  
2016 $ 61
2017 65
2018 68
2019 73
2020 $ 82