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Debt Securities (Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Securities Available For Sale) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,709 | $ 1,119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (9) | (15)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 17,638 | 24,555
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,617) | (2,807)
Debt Securities, Available-for-sale, Unrealized Loss Position | 19,347 | 25,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,626) | (2,822)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 2,759 | 716
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (471) | (46)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 2,759 | 716
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (471) | (46)
U.S. Treasury securities |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 92 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,122 | 1,201
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (69) | (99)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,214 | 1,207
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (69) | (99)
Federal agency securities |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 200 | 666
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (10) | (41)
Debt Securities, Available-for-sale, Unrealized Loss Position | 200 | 903
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (10) | (46)
Residential agency |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,216 | 241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12,079 | 15,144
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,298) | (2,127)
Debt Securities, Available-for-sale, Unrealized Loss Position | 13,295 | 15,385
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,304) | (2,130)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 2,260 | 223
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (458) | (23)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 2,260 | 223
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (458) | (23)
Commercial agency |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 383 | 612
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3) | (7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,709 | 6,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (220) | (495)
Debt Securities, Available-for-sale, Unrealized Loss Position | 4,092 | 7,195
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (223) | (502)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 499 | 493
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (13) | (23)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 499 | 493
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (13) | (23)
Commercial non-agency |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 84 | 82
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (7) | (10)
Debt Securities, Available-for-sale, Unrealized Loss Position | 84 | 82
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (7) | (10)
Corporate and other debt securities |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 18 | 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 444 | 879
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (13) | (35)
Debt Securities, Available-for-sale, Unrealized Loss Position | 462 | 902
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (13) | $ (35)

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