Investments (Details 2) (USD $) In Millions	Jun. 30, 2011
Amortized cost
Due in one year or less	$ 2,921
Due after one year through five years	24,089
Due after five years through ten years	19,237
Due after ten years	19,618
Subtotal	65,865
RMBS and ABS	10,637
Total amortized cost for fixed income securities	76,502
Fair value
Due in one year or less	2,965
Due after one year through five years	25,112
Due after five years through ten years	20,311
Due after ten years	19,894
Subtotal	68,282
RMBS and ABS	10,132
Total fair value for fixed income securities	$ 78,414