Investments (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amortized cost
Due in one year or less	$ 2,661
Due after one year through five years	24,065
Due after five years through ten years	16,770
Due after ten years	8,830
Subtotal	52,326
ABS, RMBS and CMBS	6,682
Total amortized cost for fixed income securities	59,008
Fair value
Due in one year or less	2,699
Due after one year through five years	24,781
Due after five years through ten years	17,293
Due after ten years	9,316
Subtotal	54,089
ABS, RMBS and CMBS	6,821
Total fixed income securities	$ 60,910	$ 77,017