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Investments (Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities And Related OTTI Recognized In Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Held to maturity, Amortized Cost	$ 13,563	$ 14,335
Held to maturity, Gross Unrealized Appreciation	41	179
Held to maturity, Gross Unrealized Depreciation	(320)	(40)
Held to maturity, at Fair Value	13,284	14,474
Held to maturity, OTTI recognized in AOCI		0
U.S. Treasury and agency
Investment [Line Items]
Held to maturity, Amortized Cost	1,112	908
Held to maturity, Gross Unrealized Appreciation	6	12
Held to maturity, Gross Unrealized Depreciation	(25)	(5)
Held to maturity, at Fair Value	1,093	915
Held to maturity, OTTI recognized in AOCI	0	0
Foreign
Investment [Line Items]
Held to maturity, Amortized Cost	1,601	1,738
Held to maturity, Gross Unrealized Appreciation	10	27
Held to maturity, Gross Unrealized Depreciation	(25)	(8)
Held to maturity, at Fair Value	1,586	1,757
Held to maturity, OTTI recognized in AOCI	0	0
Corporate securities
Investment [Line Items]
Held to maturity, Amortized Cost	2,658	3,159
Held to maturity, Gross Unrealized Appreciation	11	67
Held to maturity, Gross Unrealized Depreciation	(91)	(7)
Held to maturity, at Fair Value	2,578	3,219
Held to maturity, OTTI recognized in AOCI	0	0
Mortgage-backed securities
Investment [Line Items]
Held to maturity, Amortized Cost	2,574	2,724
Held to maturity, Gross Unrealized Appreciation	4	23
Held to maturity, Gross Unrealized Depreciation	(75)	(5)
Held to maturity, at Fair Value	2,503	2,742
Held to maturity, OTTI recognized in AOCI	0	0
States, municipalities, and political subdivisions
Investment [Line Items]
Held to maturity, Amortized Cost	5,618	5,806
Held to maturity, Gross Unrealized Appreciation	10	50
Held to maturity, Gross Unrealized Depreciation	(104)	(15)
Held to maturity, at Fair Value	5,524	5,841
Held to maturity, OTTI recognized in AOCI	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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