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Investments - Scheduled maturities of available for sale fixed maturities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Fair Value Percent, Fiscal Year Maturity [Abstract]  
Average life of ABS 5 years
Average life of MBS 4 years 6 months
Fixed maturities  
Amortized Cost Basis, Fiscal Year Maturity [Abstract]  
One year or less $ 746
After one year through five years 6,730
After five years through ten years 13,235
After ten years 4,680
Fixed maturities amortized cost, Subtotal 25,391
ABS (average life of approximately 5 years) 7,836
MBS (average life of approximately 4.5 years) 3,811
Amortized Cost 37,038
Fair Value, Fiscal Year Maturity [Abstract]  
One year or less 759
After one year through five years 6,939
After five years through ten years 13,662
After ten years 4,868
Fixed maturities fair value, Subtotal 26,228
ABS (average life of approximately 5 years) 7,962
MBS (average life of approximately 4.5 years) 4,189
Fair Value $ 38,379
Fair Value Percent, Fiscal Year Maturity [Abstract]  
One year or less 2.00%
After one year through five years 18.00%
After five years through ten years 35.00%
After ten years 13.00%
Fixed maturities fair value, Subtotal, Percent 68.00%
ABS (average life of approximately 5 years) 21.00%
MBS (average life of approximately 4.5 years) 11.00%
Fair value, Total, Percent 100.00%