Investments (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
The scheduled maturities of available for sale fixed maturities
Fixed maturities amortized cost, One year or less	$ 1,077
Fixed maturities fair value, One year or less	1,101
Fixed maturities fair value, One year or less, Percent	4.00%
Fixed maturities amortized cost, After one year through five years	4,674
Fixed maturities fair value, After one year through five years	5,014
Fixed maturities fair value, After one year through five years, Percent	20.00%
Fixed maturities amortized cost, After five years through ten years	6,588
Fixed maturities fair value, After five years through ten years	6,915
Fixed maturities fair value, After five years through ten years, Percent	28.00%
Fixed maturities amortized cost, After ten years	2,728
Fixed maturities fair value, After ten years	2,772
Fixed maturities fair value, After ten years, Percent	11.00%
Fixed maturities amortized cost, Subtotal	15,067
Fixed maturities fair value, Subtotal	15,802
Fixed maturities fair value, Subtotal, Percent	63.00%
Fixed maturities amortized cost, ABS	2,205
Fixed maturities fair value, ABS	2,234
Fixed maturities fair value, ABS, Percent	9.00%
Fixed maturities amortized cost, MBS	6,468
Fixed maturities fair value, MBS	6,999
Fixed maturities fair value, MBS, Percent	28.00%
Fixed Maturity [Member]
The scheduled maturities of available for sale fixed maturities
Amortized Cost	23,740
Fair Value	$ 25,035
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 fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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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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Amount of available-for-sale debt securities at cost, net of adjustments, maturing after 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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