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Investments Investments (Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale, at amortized cost | $ 80,959 | $ 82,580
Debt Securities, Available-for-sale, Allowance for Credit Loss | (176) | 0
Available for Sale, Gross Unrealized Appreciation | 2,767 | 3,074
Available for Sale, Gross Unrealized Depreciation | (2,020) | (166)
Available for sale, Fair Value | 81,530 | 85,488
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | (30)
U.S. Treasury and agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale, at amortized cost | 2,773 | 3,188
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Available for Sale, Gross Unrealized Appreciation | 240 | 96
Available for Sale, Gross Unrealized Depreciation | 0 | (1)
Available for sale, Fair Value | 3,013 | 3,283
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 0
Foreign |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale, at amortized cost | 22,615 | 22,670
Debt Securities, Available-for-sale, Allowance for Credit Loss | (44) |
Available for Sale, Gross Unrealized Appreciation | 850 | 1,099
Available for Sale, Gross Unrealized Depreciation | (577) | (62)
Available for sale, Fair Value | 22,844 | 23,707
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | (25)
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale, at amortized cost | 31,530 | 30,689
Debt Securities, Available-for-sale, Allowance for Credit Loss | (132) |
Available for Sale, Gross Unrealized Appreciation | 644 | 1,180
Available for Sale, Gross Unrealized Depreciation | (1,374) | (78)
Available for sale, Fair Value | 30,668 | 31,791
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | (5)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale, at amortized cost | 17,073 | 18,712
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Available for Sale, Gross Unrealized Appreciation | 864 | 494
Available for Sale, Gross Unrealized Depreciation | (52) | (14)
Available for sale, Fair Value | 17,885 | 19,192
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 0
States, municipalities, and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for sale, at amortized cost | 6,968 | 7,321
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Available for Sale, Gross Unrealized Appreciation | 169 | 205
Available for Sale, Gross Unrealized Depreciation | (17) | (11)
Available for sale, Fair Value | $ 7,120 | 7,515
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, 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 available-for-sale 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 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 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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