Investments- Scheduled Maturities (Details 2) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Amortized cost
Due in one year or less	$ 1,341
Due after one year through five years	8,397
Due after five years through ten years	7,493
Due after ten years	4,461
Subtotal	21,692
ABS, RMBS and CMBS	840
Amortized cost	22,532	$ 23,112
Fair value
Due in one year or less	1,362
Due after one year through five years	8,786
Due after five years through ten years	7,687
Due after ten years	4,979
Subtotal	22,814
ABS, RMBS and CMBS	882
Fair value	$ 23,696	$ 24,222