Investments (Details 2) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Amortized cost
Due in one year or less	$ 4,394
Due after one year through five years	26,870
Due after five years through ten years	16,262
Due after ten years	5,407
Subtotal	52,933
ABS, RMBS and CMBS	2,837
Amortized cost	55,770	$ 57,201
Fair value
Due in one year or less	4,423
Due after one year through five years	27,753
Due after five years through ten years	16,854
Due after ten years	6,187
Subtotal	55,217
ABS, RMBS and CMBS	2,912
Total fixed income securities	$ 58,129	$ 57,948