Investments and Derivative Instruments (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Available-for-sale Securities, Amortized Cost
One year or less, amortized cost	$ 2,580
Over one year through five years, amortized cost	11,931
Over five years through ten years, amortized cost	10,294
Over ten years, amortized cost	22,107
Subtotal, amortized cost	46,912
Mortgage-backed and asset-backed securities, amortized cost	13,543
Total fixed maturities, AFS, amortized cost	60,455
Available-for-sale Securities, Fair Value
One year or less, fair value	2,618
Over one year through five years, fair value	12,526
Over five years through ten years, fair value	10,770
Over ten years, fair value	23,655
Subtotal, fair value	49,569
Mortgage-backed and asset-backed securities, fair value	13,770
Total fixed maturities, AFS, fair value	$ 63,339	$ 62,357