Investments (Details 3) - Jun. 30, 2015 - Fixed Maturity [Member] - USD ($) $ in Millions	Total
Amortized Cost Basis, Fiscal Year Maturity [Abstract]
One year or less	$ 957
After one year through five years	4,854
After five years through ten years	10,092
After ten years	4,787
Fixed maturities amortized cost, Subtotal	20,690
ABS (average life of approximately 5 years)	4,355
MBS (average life of approximately 4-1/2 years)	5,960
Amortized Cost	31,005
Fair Value, Fiscal Year Maturity [Abstract]
One year or less	978
After one year through five years	5,172
After five years through ten years	10,352
After ten years	4,938
Fixed maturities fair value, Subtotal	21,440
ABS (average life of approximately 5 years)	4,383
MBS (average life of approximately 4-1/2 years)	6,437
Fair Value	$ 32,260
Fair Value Percent, Fiscal Year Maturity [Abstract]
One year or less	3.00%
After one year through five years	16.00%
After five years through ten years	32.00%
After ten years	15.00%
Fixed maturities fair value, Subtotal, Percent	66.00%
ABS (average life of approximately 5 years)	14.00%
MBS (average life of approximately 4-1/2 years)	20.00%
Fair value, Total, Percent	100.00%