Investments (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
The scheduled maturities of available for sale fixed maturities
Fixed maturities amortized cost, One year or less	$ 965
Fixed maturities fair value, One year or less	989
Fixed maturities fair value, One year or less, Percent	4.00%
Fixed maturities amortized cost, After one year through five years	4,669
Fixed maturities fair value, After one year through five years	5,081
Fixed maturities fair value, After one year through five years, Percent	21.00%
Fixed maturities amortized cost, After five years through ten years	6,074
Fixed maturities fair value, After five years through ten years	6,738
Fixed maturities fair value, After five years through ten years, Percent	27.00%
Fixed maturities amortized cost, After ten years	2,615
Fixed maturities fair value, After ten years	2,832
Fixed maturities fair value, After ten years, Percent	11.00%
Fixed maturities amortized cost, Subtotal	14,323
Fixed maturities fair value, Subtotal	15,640
Fixed maturities fair value, Subtotal, Percent	63.00%
Fixed maturities amortized cost, ABS	1,954
Fixed maturities fair value, ABS	2,014
Fixed maturities fair value, ABS, Percent	8.00%
Fixed maturities amortized cost, MBS	6,478
Fixed maturities fair value, MBS	7,121
Fixed maturities fair value, MBS, Percent	29.00%
Fixed Maturity [Member]
The scheduled maturities of available for sale fixed maturities
Amortized Cost	22,755
Fair Value	$ 24,775
Fair value, Total, Percent	100.00%

Asset-backed securities, amortized cost.

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Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value, Percent.

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Available for sale securities debt maturities excluding ABS and MBS amortized cost.

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Mortgage-backed securities, amortized cost.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth 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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