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Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) $ in Millions | Jun. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value - Nine months or greater, but less than twelve months |  | $ 32,167 | $ 5,844
Fair Value - Twelve months or greater |  | 5,590 | 6,063
Fair Value - Total |  | 37,757 | 11,907
Losses - Nine months or greater, but less than twelve months |  | 1,130 | 89
Losses - Twelve months or greater |  | 620 | 374
Losses - Total |  | $ 1,750 | $ 463
Number of Securities - Total | security |  | 3,092 | 1,128
Fair Value Decline, Greater Than 20% [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value - Less than six months |  | $ 173 | $ 156
Fair Value - Six months or greater, but less than nine months |  | 39 | 2
Fair Value - Nine months or greater, but less than twelve months |  | 7 | 15
Fair Value - Twelve months or greater |  | 117 | 215
Fair Value - Total |  | 336 | 388
Losses - Less than six months |  | 59 | 57
Losses - Six months or greater, but less than nine months |  | 16 | 1
Losses - Nine months or greater, but less than twelve months |  | 4 | 8
Losses - Twelve months or greater |  | 47 | 78
Losses - Total |  | 126 | 144
OTTI - Less than six months |  |  | 1
OTTI - Twelve months or greater |  | 8 | 10
OTTI - Total |  | $ 8 | $ 11
Number of Securities - Less than six months | security | [1] | 23 | 26
Number of Securities - Six months or greater, but less than nine months | security | [1] | 6 | 4
Number of Securities - Nine months or greater, but less than twelve months | security | [1] | 1 | 7
Number of Securities - Twelve months or greater | security | [1] | 28 | 49
Number of Securities - Total | security | [1] | 58 | 86
[1] | We may reflect a security in more than one aging category based on various purchase dates.

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