Investments (Details 2) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Amortized cost
Due in one year or less	$ 4,465
Due after one year through five years	25,511
Due after five years through ten years	16,859
Due after ten years	5,933
Subtotal	52,768
ABS, RMBS and CMBS	4,150
Amortized cost	56,918	$ 59,672
Fair value
Due in one year or less	4,494
Due after one year through five years	26,082
Due after five years through ten years	16,944
Due after ten years	6,473
Subtotal	53,993
ABS, RMBS and CMBS	4,264
Total fixed income securities	$ 58,257	$ 62,440