Investments- Scheduled Maturities (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Amortized cost
Due in one year or less	$ 1,220
Due after one year through five years	5,226
Due after five years through ten years	9,516
Due after ten years	7,256
Subtotal	23,218
ABS, RMBS and CMBS	2,088
Amortized cost	25,306	25,822
Fair value
Due in one year or less	1,239
Due after one year through five years	5,633
Due after five years through ten years	10,139
Due after ten years	8,617
Subtotal	25,628
ABS, RMBS and CMBS	2,174
Fair value	$ 27,802	$ 28,117