Investments (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Amortized cost
Due in one year or less	$ 3,272
Due after one year through five years	25,728
Due after five years through ten years	16,257
Due after ten years	8,332
Subtotal	53,589
ABS, RMBS and CMBS	5,858
Total amortized cost for fixed income securities	59,447
Fair value
Due in one year or less	3,316
Due after one year through five years	26,606
Due after five years through ten years	17,225
Due after ten years	9,436
Subtotal	56,583
ABS, RMBS and CMBS	6,051
Total fixed income securities	$ 62,634	$ 60,910