Investments (Details 2) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Amortized cost
Due in one year or less	$ 4,206
Due after one year through five years	26,150
Due after five years through ten years	16,030
Due after ten years	5,481
Subtotal	51,867
ABS, RMBS and CMBS	3,760
Amortized cost	55,627	$ 57,201
Fair value
Due in one year or less	4,226
Due after one year through five years	26,792
Due after five years through ten years	16,384
Due after ten years	6,068
Subtotal	53,470
ABS, RMBS and CMBS	3,821
Total fixed income securities	$ 57,291	$ 57,948