Investments (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amortized cost
Due in one year or less	$ 1,106
Due after one year through five years	5,060
Due after five years through ten years	10,955
Due after ten years	7,819
Subtotal	24,940
ABS, RMBS and CMBS	2,487
Total	27,427
Fair value
Due in one year or less	1,132
Due after one year through five years	5,457
Due after five years through ten years	11,316
Due after ten years	8,290
Subtotal	26,195
ABS, RMBS and CMBS	2,561
Total	$ 28,756	$ 44,876