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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, 2025 | Dec. 31, 2024
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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 | $ 1,978 | $ 9,881
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (21) | (256)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12,009 | 14,303
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (977) | (1,729)
Debt Securities, Available-for-sale, Unrealized Loss Position | 13,987 | 24,184
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (998) | (1,985)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 197 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 5,519 | 4,226
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (945) | (944)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 5,716 | 4,226
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (946) | (944)
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 | 551 | 612
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (7) | (14)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,031 | 1,033
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (52) | (73)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,582 | 1,645
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (59) | (87)
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 | 234 | 155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 138 | 195
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8) | (14)
Debt Securities, Available-for-sale, Unrealized Loss Position | 372 | 350
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (9) | (17)
Residential agency |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,193 | 8,012
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13) | (203)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 8,144 | 9,605
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (752) | (1,354)
Debt Securities, Available-for-sale, Unrealized Loss Position | 9,337 | 17,617
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (765) | (1,557)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 197 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 5,118 | 3,734
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (937) | (929)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 5,315 | 3,734
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (938) | (929)
Commercial agency |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 1,043
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (35)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,430 | 2,991
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (152) | (265)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,430 | 4,034
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (152) | (300)
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 | 401 | 492
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8) | (15)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 401 | 492
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (8) | (15)
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 | (9) | (10)
Debt Securities, Available-for-sale, Unrealized Loss Position | 84 | 82
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (9) | (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 | 0 | 59
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 182 | 397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4) | (13)
Debt Securities, Available-for-sale, Unrealized Loss Position | 182 | 456
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (4) | $ (14)

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