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Securities (Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Securities Available For Sale and Held to Maturity) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Unrealized Loss And Fair Value On Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 9,956 | $ 1,733
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (144) | (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 69 | 101
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value | 10,025 | 1,834
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (144) | (10)
Federal Agency Securities [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 64 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 33 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value | 97 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1) |
Residential Agency [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 8,017 | 914
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (111) | (4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 17 | 101
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value | 8,034 | 1,015
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (111) | (4)
Commercial Agency [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,564 | 819
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (31) | (6)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 19 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value | 1,583 | 819
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (31) | $ (6)
Corporate and other debt securities [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 311 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Estimated Fair Value | 311 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1) |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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