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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, 2022 | Dec. 31, 2021
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Unrealized Loss And Fair Value On Securities [Line Items] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | $ 817 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (31) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 0 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 817 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 31 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 22,224 | $ 12,378
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,459 | 216
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,461 | 1,446
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 799 | 59
Debt Securities, Available-for-sale, Unrealized Loss Position | 27,685 | 13,824
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2,258 | 275
US Treasury Securities [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 994 | 1,010
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 82 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 999 | 1,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 83 | 7
Federal Agency Securities [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 623 | 63
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 19 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 56 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 9 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 679 | 63
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 28 | 3
Residential Agency [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 296 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (20) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 0 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 296 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 20 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 14,107 | 9,528
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,077 | 171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,321 | 686
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 654 | 27
Debt Securities, Available-for-sale, Unrealized Loss Position | 18,428 | 10,214
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,731 | 198
Commercial Agency [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 521 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (11) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 0 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 521 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | 11 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 5,214 | 1,333
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 225 | 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,003 | 760
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 131 | 32
Debt Securities, Available-for-sale, Unrealized Loss Position | 6,217 | 2,093
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 356 | 61
Commercial Non-Agency [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 315 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 315 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 9 |
Corporate and other debt securities [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 971 | 444
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 47 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 76 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,047 | 444
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 51 | $ 6

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