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Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) $ in Millions | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value - Nine months or greater, but less than twelve months |  | $ 5,844 | $ 17,813
Fair Value - Twelve months or greater |  | 6,063 | 4,155
Fair Value - Total |  | 11,907 | 21,968
Losses - Nine months or greater, but less than twelve months |  | 89 | 659
Losses - Twelve months or greater |  | 374 | 507
Losses - Total |  | $ 463 | $ 1,166
Number of Securities - Total | security |  | 1,128 | 1,744
Fair Value Decline, Greater Than 20% [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value - Less than six months |  | $ 156 | $ 174
Fair Value - Six months or greater, but less than nine months |  | 2 |
Fair Value - Nine months or greater, but less than twelve months |  | 15 | 1
Fair Value - Twelve months or greater |  | 215 | 364
Fair Value - Total |  | 388 | 539
Losses - Less than six months |  | 57 | 52
Losses - Six months or greater, but less than nine months |  | 1 |
Losses - Nine months or greater, but less than twelve months |  | 8 | 1
Losses - Twelve months or greater |  | 78 | 167
Losses - Total |  | 144 | 220
OTTI - Less than six months |  | 1 | 2
OTTI - Twelve months or greater |  | 10 | 10
OTTI - Total |  | $ 11 | $ 12
Number of Securities - Less than six months | security | [1] | 26 | 19
Number of Securities - Six months or greater, but less than nine months | security | [1] | 4 |
Number of Securities - Nine months or greater, but less than twelve months | security | [1] | 7 | 2
Number of Securities - Twelve months or greater | security | [1] | 49 | 62
Number of Securities - Total | security | [1] | 86 | 83
[1] | We may reflect a security in more than one aging category based on various purchase dates.

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