Investments (Details 3) - Fixed Maturity [Member] $ in Millions	Jun. 30, 2016 USD ($)
Amortized Cost Basis, Fiscal Year Maturity [Abstract]
One year or less	$ 906
After one year through five years	5,500
After five years through ten years	11,689
After ten years	3,870
Fixed maturities amortized cost, Subtotal	21,965
ABS (average life of approximately 5 years)	5,490
MBS (average life of approximately 4-1/2 years)	5,427
Amortized Cost	32,882
Fair Value, Fiscal Year Maturity [Abstract]
One year or less	922
After one year through five years	5,853
After five years through ten years	12,335
After ten years	4,239
Fixed maturities fair value, Subtotal	23,349
ABS (average life of approximately 5 years)	5,500
MBS (average life of approximately 4-1/2 years)	5,789
Fair Value	$ 34,638
Fair Value Percent, Fiscal Year Maturity [Abstract]
One year or less	3.00%
After one year through five years	17.00%
After five years through ten years	35.00%
After ten years	12.00%
Fixed maturities fair value, Subtotal, Percent	67.00%
ABS (average life of approximately 5 years)	16.00%
MBS (average life of approximately 4-1/2 years)	17.00%
Fair value, Total, Percent	100.00%