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Investments (Schedule Of Amortized Cost And Fair Value Of Held-to-Maturity And Related Other-Than-Temporary Impairment Recognized In Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Fixed maturities held to maturity, at amortized cost (fair value – $14,474 and $10,670) | $ 14,335 | $ 10,644
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 179 | 148
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (40) | (122)
Held to maturity, Fair Value | 14,474 | 10,670
Held to maturity, OTTI recognized in AOCI |  | 0
U.S. Treasury and agency |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fixed maturities held to maturity, at amortized cost (fair value – $14,474 and $10,670) | 908 | 655
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 12 | 9
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (5) | (3)
Held to maturity, Fair Value | 915 | 661
Held to maturity, OTTI recognized in AOCI | 0 | 0
Foreign |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fixed maturities held to maturity, at amortized cost (fair value – $14,474 and $10,670) | 1,738 | 640
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 27 | 28
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (8) | (1)
Held to maturity, Fair Value | 1,757 | 667
Held to maturity, OTTI recognized in AOCI | 0 | 0
Corporate securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fixed maturities held to maturity, at amortized cost (fair value – $14,474 and $10,670) | 3,159 | 2,771
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 67 | 50
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (7) | (26)
Held to maturity, Fair Value | 3,219 | 2,795
Held to maturity, OTTI recognized in AOCI | 0 | 0
Mortgage backed-securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fixed maturities held to maturity, at amortized cost (fair value – $14,474 and $10,670) | 2,724 | 1,393
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 23 | 35
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (5) | 0
Held to maturity, Fair Value | 2,742 | 1,428
Held to maturity, OTTI recognized in AOCI | 0 | 0
States, municipalities, and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fixed maturities held to maturity, at amortized cost (fair value – $14,474 and $10,670) | 5,806 | 5,185
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 50 | 26
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (15) | (92)
Held to maturity, Fair Value | 5,841 | 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 after other than temporary impairment (OTTI) accretion, of 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 (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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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