Investments (Details 2) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Amortized cost
Due in one year or less	$ 4,193
Due after one year through five years	29,206
Due after five years through ten years	16,306
Due after ten years	5,432
Subtotal	55,137
ABS, RMBS and CMBS	2,057
Amortized cost	57,194	$ 56,576
Fair value
Due in one year or less	4,225
Due after one year through five years	29,746
Due after five years through ten years	16,549
Due after ten years	5,968
Subtotal	56,488
ABS, RMBS and CMBS	2,148
Total fixed income securities	$ 58,636	$ 57,839