Investments (Details 2) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Amortized cost
Due in one year or less	$ 4,446
Due after one year through five years	25,081
Due after five years through ten years	17,248
Due after ten years	7,595
Subtotal	54,370
ABS, RMBS and CMBS	3,601
Amortized cost	57,971	$ 59,672
Fair value
Due in one year or less	4,491
Due after one year through five years	25,705
Due after five years through ten years	17,605
Due after ten years	8,395
Subtotal	56,196
ABS, RMBS and CMBS	3,734
Total fixed income securities	$ 59,930	$ 62,440