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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, 2017 | Dec. 31, 2016
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Investment [Line Items] |  |
Held to maturity, Amortized Cost | $ 10,160 | $ 10,644
Held to maturity, Gross Unrealized Appreciation | 216 | 148
Held to maturity, Gross Unrealized Depreciation | (11) | (122)
Held to maturity, at Fair Value | 10,365 | 10,670
Held to maturity, OTTI recognized in AOCI |  | 0
U.S. Treasury And Agency [Member] |  |
Investment [Line Items] |  |
Held to maturity, Amortized Cost | 611 | 655
Held to maturity, Gross Unrealized Appreciation | 13 | 9
Held to maturity, Gross Unrealized Depreciation | (3) | (3)
Held to maturity, at Fair Value | 621 | 661
Held to maturity, OTTI recognized in AOCI | 0 | 0
Foreign [Member] |  |
Investment [Line Items] |  |
Held to maturity, Amortized Cost | 616 | 640
Held to maturity, Gross Unrealized Appreciation | 28 | 28
Held to maturity, Gross Unrealized Depreciation | 0 | (1)
Held to maturity, at Fair Value | 644 | 667
Held to maturity, OTTI recognized in AOCI | 0 | 0
Corporate [Member] |  |
Investment [Line Items] |  |
Held to maturity, Amortized Cost | 2,531 | 2,771
Held to maturity, Gross Unrealized Appreciation | 63 | 50
Held to maturity, Gross Unrealized Depreciation | (5) | (26)
Held to maturity, at Fair Value | 2,589 | 2,795
Held to maturity, OTTI recognized in AOCI | 0 | 0
Collateralized Mortgage Backed Securities [Member] |  |
Investment [Line Items] |  |
Held to maturity, Amortized Cost | 1,223 | 1,393
Held to maturity, Gross Unrealized Appreciation | 35 | 35
Held to maturity, Gross Unrealized Depreciation | 0 | 0
Held to maturity, at Fair Value | 1,258 | 1,428
Held to maturity, OTTI recognized in AOCI | 0 | 0
States, Municipalities, And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Held to maturity, Amortized Cost | 5,179 | 5,185
Held to maturity, Gross Unrealized Appreciation | 77 | 26
Held to maturity, Gross Unrealized Depreciation | (3) | (92)
Held to maturity, at Fair Value | 5,253 | 5,119
Held to maturity, OTTI recognized in AOCI | $ 0 | $ 0

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284427-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (dd) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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