Investments and Derivative Instruments (Details 4) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Available-for-sale Securities, Amortized Cost
One year or less, amortized cost	$ 1,556
Over one year through five years, amortized cost	5,273
Over five years through ten years, amortized cost	5,174
Over ten years, amortized cost	9,022
Subtotal, amortized cost	21,025
Mortgage-backed and asset-backed securities, amortized cost	7,813
Available-for-sale Securities, Fair Value
One year or less, fair value	1,585
Over one year through five years, fair value	5,468
Over five years through ten years, fair value	5,309
Over ten years, fair value	9,520
Subtotal, fair value	21,882
Mortgage-backed and asset-backed securities, fair value	7,859
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	28,838
Total fixed maturities, AFS, fair value	$ 29,741	$ 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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