Investments (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Amortized cost
Due in one year or less	$ 1,362
Due after one year through five years	5,066
Due after five years through ten years	10,477
Due after ten years	7,492
Subtotal	24,397
ABS, RMBS and CMBS	2,140
Total	26,537
Fair value
Due in one year or less	1,388
Due after one year through five years	5,529
Due after five years through ten years	11,203
Due after ten years	8,560
Subtotal	26,680
ABS, RMBS and CMBS	2,244
Total	$ 28,924	$ 28,756