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Investments (Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 88,265 |  | $ 85,188 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (11) | $ (15) | (20) | $ (69) | $ (176) | $ 0
Available for Sale, Gross Unrealized Appreciation | 4,228 |  | 5,655 |  |  |
Available for Sale, Gross Unrealized Depreciation | (319) |  | (124) |  |  |
Available for sale, Fair Value | 92,163 |  | 90,699 |  |  |
U.S. Treasury / Agency |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,349 |  | 2,471 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available for Sale, Gross Unrealized Appreciation | 134 |  | 199 |  |  |
Available for Sale, Gross Unrealized Depreciation | (5) |  | 0 |  |  |
Available for sale, Fair Value | 2,478 |  | 2,670 |  |  |
Non-U.S. |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 25,269 |  | 24,594 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (5) |  | (6) |  |  |
Available for Sale, Gross Unrealized Appreciation | 1,296 |  | 1,808 |  |  |
Available for Sale, Gross Unrealized Depreciation | (148) |  | (42) |  |  |
Available for sale, Fair Value | 26,412 |  | 26,354 |  |  |
Corporate and asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 35,916 |  | 34,095 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (6) |  | (14) |  |  |
Available for Sale, Gross Unrealized Appreciation | 1,779 |  | 2,322 |  |  |
Available for Sale, Gross Unrealized Depreciation | (114) |  | (72) |  |  |
Available for sale, Fair Value | 37,575 |  | 36,331 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 18,851 |  | 17,456 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available for Sale, Gross Unrealized Appreciation | 752 |  | 1,022 |  |  |
Available for Sale, Gross Unrealized Depreciation | (50) |  | (8) |  |  |
Available for sale, Fair Value | 19,553 |  | 18,470 |  |  |
Municipal |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,880 |  | 6,572 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  |
Available for Sale, Gross Unrealized Appreciation | 267 |  | 304 |  |  |
Available for Sale, Gross Unrealized Depreciation | (2) |  | (2) |  |  |
Available for sale, Fair Value | $ 6,145 |  | $ 6,874 |  |  |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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