Investments (Available-For-Sale Securities By Contractual Maturities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale Securities, Debt Maturities, Amortized Cost
Due in one year or less	$ 2,258
Due after one year through five years	17,221
Due after five years through ten years	22,179
Due after ten years	32,630
Amortized cost	79,412	77,217
Available-for-sale Securities, Debt Maturities, Fair Value
Due in one year or less	2,309
Due after one year through five years	18,584
Due after five years through ten years	23,117
Due after ten years	37,657
Fair Value	87,069us-gaap_AvailableForSaleSecurities	80,976us-gaap_AvailableForSaleSecurities
Fixed Maturity AFS Securities Excluding MBS and CDOs [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized cost	74,288
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	81,667
Fixed maturity securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized cost	79,196	77,035
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	86,838	80,775
Equity securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized cost	216	182
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	231	201
Mortgage-backed securities [Member] \| Fixed maturity securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized cost	4,533
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	4,796
CLOs [Member] \| Fixed maturity securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost
Amortized cost	375	232
Available-for-sale Securities, Debt Maturities, Fair Value
Fair Value	$ 375	$ 225

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

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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 fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at fair value maturing after 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 next 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 next fiscal year following the latest fiscal year.

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