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Debt Securities (Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Securities Available For Sale) (Details) - USD ($) $ in Millions | Jun. 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 | $ 4,201 | $ 1,119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (50) | (15)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 21,926 | 24,555
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,052) | (2,807)
Debt Securities, Available-for-sale, Unrealized Loss Position | 26,127 | 25,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (3,102) | (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 | 690 | 716
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (51) | (46)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 690 | 716
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (51) | (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 | 137 | 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 | 1,095 | 1,201
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (97) | (99)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,232 | 1,207
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (97) | (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 | 117 | 237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | (5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 296 | 666
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (19) | (41)
Debt Securities, Available-for-sale, Unrealized Loss Position | 413 | 903
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (20) | (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 | 3,703 | 241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (46) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,133 | 15,144
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,406) | (2,127)
Debt Securities, Available-for-sale, Unrealized Loss Position | 17,836 | 15,385
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,452) | (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 | 200 | 223
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (27) | (23)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 200 | 223
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (27) | (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 | 139 | 612
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) | (7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,632 | 6,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (488) | (495)
Debt Securities, Available-for-sale, Unrealized Loss Position | 5,771 | 7,195
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (490) | (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 | 490 | 493
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (24) | (23)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 490 | 493
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (24) | (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 | 81 | 82
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (11) | (10)
Debt Securities, Available-for-sale, Unrealized Loss Position | 81 | 82
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (11) | (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 | 105 | 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 689 | 879
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (31) | (35)
Debt Securities, Available-for-sale, Unrealized Loss Position | 794 | 902
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (32) | $ (35)

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