Investments (Details 2) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Amortized cost
Due in one year or less	$ 4,084
Due after one year through five years	29,357
Due after five years through ten years	16,576
Due after ten years	5,365
Subtotal	55,382
ABS, RMBS and CMBS	2,393
Amortized cost	57,775	$ 57,201
Fair value
Due in one year or less	4,115
Due after one year through five years	30,222
Due after five years through ten years	17,315
Due after ten years	6,171
Subtotal	57,823
ABS, RMBS and CMBS	2,483
Total fixed income securities	$ 60,306	$ 57,948