Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	$ 79,412	$ 77,217
Gross Unrealized Gains	8,230	5,168
Gross Unrealized Losses	460	1,265
Gross Unrealized OTTI	113	144
Fair Value	87,069us-gaap_AvailableForSaleSecurities	80,976us-gaap_AvailableForSaleSecurities
Equity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	216	182
Gross Unrealized Gains	16	19
Gross Unrealized Losses	1
Fair Value	231	201
Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	79,196	77,035
Gross Unrealized Gains	8,214	5,149
Gross Unrealized Losses	459	1,265
Gross Unrealized OTTI	113	144
Fair Value	86,838	80,775
Corporate bonds [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	67,153	64,591
Gross Unrealized Gains	6,714	4,312
Gross Unrealized Losses	409	1,125
Gross Unrealized OTTI	42	42
Fair Value	73,416	67,736
Asset-backed Securities [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	1,087	1,217
Gross Unrealized Gains	86	62
Gross Unrealized Losses	1	32
Gross Unrealized OTTI	42	48
Fair Value	1,130	1,199
U.S. government bonds [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	379	355
Gross Unrealized Gains	56	26
Gross Unrealized Losses		14
Fair Value	435	367
Foreign government bonds [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	473	505
Gross Unrealized Gains	68	45
Gross Unrealized Losses		1
Fair Value	541	549
RMBS [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	3,979	4,135
Gross Unrealized Gains	268	256
Gross Unrealized Losses	3	10
Gross Unrealized OTTI	18	31
Fair Value	4,226	4,350
CMBS [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	554	713
Gross Unrealized Gains	27	36
Gross Unrealized Losses		4
Gross Unrealized OTTI	11	17
Fair Value	570	728
CLOs [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	375	232
Gross Unrealized Gains	2
Gross Unrealized Losses	2	1
Gross Unrealized OTTI		6
Fair Value	375	225
State and municipal bonds [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	3,723	3,638
Gross Unrealized Gains	874	308
Gross Unrealized Losses	4	27
Fair Value	4,593	3,919
Hybrid and redeemable preferred securities [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	886	967
Gross Unrealized Gains	108	89
Gross Unrealized Losses	40	51
Fair Value	954	1,005
VIEs' fixed maturity securities [Member] \| Fixed maturity securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized Cost	587	682
Gross Unrealized Gains	11	15
Fair Value	$ 598	$ 697

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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Unrealized other than temporary impairment losses, investments, available-for-sale securities.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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