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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		$ 86,889	$ 84,747
Gross unrealized gains		7,638	5,851
Gross unrealized losses		515	1,139
OTTI	[1]	(57)	(29)
Fair value		94,069	89,488
Equity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		296	260
Gross unrealized gains		19	19
Gross unrealized losses		13	4
Fair value		302	275
Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		86,593	84,487
Gross unrealized gains		7,619	5,832
Gross unrealized losses		502	1,135
OTTI	[1]	(57)	(29)
Fair value		93,767	89,213
Corporate bonds [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		75,400	73,275
Gross unrealized gains		6,317	4,754
Gross unrealized losses		421	970
OTTI	[1]	(5)	(5)
Fair value		81,301	77,064
ABS [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		951	1,047
Gross unrealized gains		51	39
Gross unrealized losses		7	14
OTTI	[1]	(23)	(13)
Fair value		1,018	1,085
U.S. government bonds [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		533	384
Gross unrealized gains		43	37
Gross unrealized losses		2	2
Fair value		574	419
Foreign government bonds [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		396	449
Gross unrealized gains		59	58
Gross unrealized losses			1
Fair value		455	506
RMBS [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		3,339	3,534
Gross unrealized gains		171	147
Gross unrealized losses		38	73
OTTI	[1]	(22)	(6)
Fair value		3,494	3,614
CMBS [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		532	345
Gross unrealized gains		10	8
Gross unrealized losses		2	4
OTTI	[1]	(3)	(1)
Fair value		543	350
CLOs [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		687	742
Gross unrealized gains		4	1
Gross unrealized losses		1	3
OTTI	[1]	(4)	(4)
Fair value		694	744
State and municipal bonds [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		4,180	3,929
Gross unrealized gains		877	718
Gross unrealized losses		8	20
Fair value		5,049	4,627
Hybrid and redeemable preferred securities [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost		575	582
Gross unrealized gains		87	70
Gross unrealized losses		23	48
Fair value		$ 639	604
VIEs' fixed maturity securities [Member] | Fixed maturity AFS securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost			200
Fair value			$ 200
[1] Includes unrealized (gains) and losses on impaired securities related to changes in the fair value of such securities subsequent to the impairment measurement date.

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

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