Investments and Derivative Instruments (Details 4) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available-for-sale Securities, Amortized Cost
One year or less, amortized cost	$ 1,234
Over one year through five years, amortized cost	6,203
Over five years through ten years, amortized cost	5,522
Over ten years, amortized cost	8,967
Subtotal, amortized cost	21,926
Mortgage-backed and asset-backed securities, amortized cost	9,165
Available-for-sale Securities, Fair Value
One year or less, fair value	1,255
Over one year through five years, fair value	6,501
Over five years through ten years, fair value	5,981
Over ten years, fair value	10,251
Subtotal, fair value	23,988
Mortgage-backed and asset-backed securities, fair value	9,170
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	31,091
Total fixed maturities, AFS, fair value	$ 33,158	$ 49,404

Available for sale securities debt maturities before mortgage backed and asset backed securities amortized cost.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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