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Debt Securities (Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Securities Available For Sale) (Details) - USD ($) $ in Millions | Dec. 31, 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 | $ 9,881 | $ 1,119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (256) | (15)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,303 | 24,555
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,729) | (2,807)
Debt Securities, Available-for-sale, Unrealized Loss Position | 24,184 | 25,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,985) | (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 | 4,226 | 716
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (944) | (46)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 4,226 | 716
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (944) | (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 | 612 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (14) | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,033 | 1,201
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (73) | (99)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,645 | 1,207
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (87) | (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 | 155 | 237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3) | (5)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 195 | 666
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (14) | (41)
Debt Securities, Available-for-sale, Unrealized Loss Position | 350 | 903
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (17) | (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 | 8,012 | 241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (203) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 9,605 | 15,144
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,354) | (2,127)
Debt Securities, Available-for-sale, Unrealized Loss Position | 17,617 | 15,385
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,557) | (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 | 3,734 | 223
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (929) | (23)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 3,734 | 223
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (929) | (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 | 1,043 | 612
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (35) | (7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,991 | 6,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (265) | (495)
Debt Securities, Available-for-sale, Unrealized Loss Position | 4,034 | 7,195
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (300) | (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 | 492 | 493
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (15) | (23)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 492 | 493
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (15) | (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 | 82 | 82
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (10) | (10)
Debt Securities, Available-for-sale, Unrealized Loss Position | 82 | 82
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (10) | (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 | 59 | 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 | 397 | 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 | 456 | 902
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (14) | $ (35)

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