Investments (Details 2) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Amortized cost
Due in one year or less	$ 3,441
Due after one year through five years	20,985
Due after five years through ten years	20,860
Due after ten years	19,512
Subtotal	64,798
RMBS and ABS	9,137
Total amortized cost for fixed income securities	73,935
Fair value
Due in one year or less	3,507
Due after one year through five years	21,764
Due after five years through ten years	22,097
Due after ten years	20,488
Subtotal	67,856
RMBS and ABS	8,538
Total fixed income securities	$ 76,394	$ 79,612