Investments- Scheduled Maturities (Details 2) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Amortized cost
Due in one year or less	$ 977
Due after one year through five years	7,487
Due after five years through ten years	7,710
Due after ten years	4,752
Subtotal	20,926
ABS, RMBS and CMBS	2,209
Amortized cost	23,135	$ 23,770
Fair value
Due in one year or less	984
Due after one year through five years	7,872
Due after five years through ten years	8,016
Due after ten years	5,328
Subtotal	22,200
ABS, RMBS and CMBS	2,243
Fair value	$ 24,443	$ 24,629