Investments and Derivative Instruments (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Available-for-sale Securities, Amortized Cost
One year or less, amortized cost	$ 2,125
Over one year through five years, amortized cost	11,279
Over five years through ten years, amortized cost	9,257
Over ten years, amortized cost	20,165
Subtotal, amortized cost	42,826
Mortgage-backed and asset-backed securities, amortized cost	13,492
Total fixed maturities, AFS, amortized cost	56,318
Available-for-sale Securities, Fair Value
One year or less, fair value	2,162
Over one year through five years, fair value	12,022
Over five years through ten years, fair value	9,844
Over ten years, fair value	22,353
Subtotal, fair value	46,381
Mortgage-backed and asset-backed securities, fair value	13,865
Total fixed maturities, AFS, fair value	$ 60,246	$ 62,357