Investments- Scheduled Maturities (Details 2) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Amortized cost
Due in one year or less	$ 1,581
Due after one year through five years	8,243
Due after five years through ten years	7,354
Due after ten years	4,191
Subtotal	21,369
ABS, RMBS and CMBS	712
Amortized cost	22,081	$ 23,112
Fair value
Due in one year or less	1,593
Due after one year through five years	8,649
Due after five years through ten years	7,631
Due after ten years	4,789
Subtotal	22,662
ABS, RMBS and CMBS	763
Fair value	$ 23,425	$ 24,222