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Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) $ in Millions | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value - Nine months or greater, but less than twelve months |  | $ 5,673 | $ 35,246
Fair Value - Twelve months or greater |  | 1,848 | 8,671
Fair Value - Total |  | 7,521 | 43,917
Losses - Nine months or greater, but less than twelve months |  | 73 | 1,589
Losses - Twelve months or greater |  | 170 | 856
Gross Unrealized Losses - Total |  | $ 243 | $ 2,445
Number of Securities - Total | security |  | 895 | 3,414
Fair Value Decline, Greater Than 20% [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value - Less than six months |  | $ 15 | $ 395
Fair Value - Six months or greater, but less than nine months |  | 10 | 96
Fair Value - Nine months or greater, but less than twelve months |  |  | 11
Fair Value - Twelve months or greater |  | 132 | 143
Fair Value - Total |  | 157 | 645
Losses - Less than six months |  | 5 | 124
Losses - Six months or greater, but less than nine months |  | 3 | 49
Losses - Nine months or greater, but less than twelve months |  |  | 8
Losses - Twelve months or greater |  | 76 | 74
Gross Unrealized Losses - Total |  | $ 84 | 255
OTTI - Less than six months |  |  | 1
OTTI - Twelve months or greater |  |  | 8
OTTI - Total |  |  | $ 9
Number of Securities - Less than six months | security | [1] | 7 | 45
Number of Securities - Six months or greater, but less than nine months | security | [1] | 4 | 11
Number of Securities - Nine months or greater, but less than twelve months | security | [1] |  | 2
Number of Securities - Twelve months or greater | security | [1] | 31 | 32
Number of Securities - Total | security | [1] | 42 | 90
[1] | We may reflect a security in more than one aging category based on various purchase dates.

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