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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 | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items] |  |
Document Period End Date | Dec. 31, 2019 |
Debt Securities, Held-to-maturity | $ 12,581 | $ 13,435
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 427 | 51
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3) | (227)
Held to maturity, Fair Value | 13,005 | 13,259
Held to maturity, OTTI recognized in AOCI | 0 | 0
U.S. Treasury and agency |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 1,318 | 1,185
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 29 | 8
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (11)
Held to maturity, Fair Value | 1,347 | 1,182
Held to maturity, OTTI recognized in AOCI | 0 | 0
Foreign |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 1,423 | 1,549
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 62 | 11
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (18)
Held to maturity, Fair Value | 1,485 | 1,542
Held to maturity, OTTI recognized in AOCI | 0 | 0
Corporate securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 2,349 | 2,601
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 121 | 11
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2) | (104)
Held to maturity, Fair Value | 2,468 | 2,508
Held to maturity, OTTI recognized in AOCI | 0 | 0
Mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 2,331 | 2,524
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 65 | 5
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (43)
Held to maturity, Fair Value | 2,396 | 2,486
Held to maturity, OTTI recognized in AOCI | 0 | 0
States, municipalities, and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-maturity | 5,160 | 5,576
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 150 | 16
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1) | (51)
Held to maturity, Fair Value | 5,309 | 5,541
Held to maturity, OTTI recognized in AOCI | $ 0 | $ 0

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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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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