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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 | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Amortized Cost | $ 12,070 | $ 12,581
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (45) | 0
Debt securities, held to maturity, net carrying value | 12,025 |
Held-to-maturity, Gross Unrealized Appreciation | 487 | 427
Held-to-maturity, Gross Unrealized Depreciation | (41) | (3)
Held-to-maturity, Fair Value | 12,471 | 13,005
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Held-to-maturity, Debt Securities |  | 0
U.S. Treasury and agency |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Amortized Cost | 1,208 | 1,318
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |
Debt securities, held to maturity, net carrying value | 1,208 |
Held-to-maturity, Gross Unrealized Appreciation | 75 | 29
Held-to-maturity, Gross Unrealized Depreciation | 0 | 0
Held-to-maturity, Fair Value | 1,283 | 1,347
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Held-to-maturity, Debt Securities |  | 0
Foreign |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Amortized Cost | 1,294 | 1,423
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (7) |
Debt securities, held to maturity, net carrying value | 1,287 |
Held-to-maturity, Gross Unrealized Appreciation | 63 | 62
Held-to-maturity, Gross Unrealized Depreciation | (7) | 0
Held-to-maturity, Fair Value | 1,343 | 1,485
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Held-to-maturity, Debt Securities |  | 0
Corporate securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Amortized Cost | 2,272 | 2,349
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (36) |
Debt securities, held to maturity, net carrying value | 2,236 |
Held-to-maturity, Gross Unrealized Appreciation | 113 | 121
Held-to-maturity, Gross Unrealized Depreciation | (27) | (2)
Held-to-maturity, Fair Value | 2,322 | 2,468
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Held-to-maturity, Debt Securities |  | 0
Mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Amortized Cost | 2,266 | 2,331
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (1) |
Debt securities, held to maturity, net carrying value | 2,265 |
Held-to-maturity, Gross Unrealized Appreciation | 106 | 65
Held-to-maturity, Gross Unrealized Depreciation | (4) | 0
Held-to-maturity, Fair Value | 2,367 | 2,396
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Held-to-maturity, Debt Securities |  | 0
States, municipalities, and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Amortized Cost | 5,030 | 5,160
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (1) |
Debt securities, held to maturity, net carrying value | 5,029 |
Held-to-maturity, Gross Unrealized Appreciation | 130 | 150
Held-to-maturity, Gross Unrealized Depreciation | (3) | (1)
Held-to-maturity, Fair Value | $ 5,156 | 5,309
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Held-to-maturity, Debt Securities |  | $ 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284427-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (dd) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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