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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, 2023 | Dec. 31, 2022
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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 | $ 2,123 | $ 17,379
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (118) | (1,507)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 24,020 | 10,436
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4,007) | (1,928)
Debt Securities, Available-for-sale, Unrealized Loss Position | 26,143 | 27,815
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (4,125) | (3,435)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 0 | 720
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (55)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 703 | 31
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (69) | (5)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 703 | 751
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (69) | (60)
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 | 13 | 276
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (8)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,162 | 903
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (130) | (115)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,175 | 1,179
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (130) | (123)
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 | 332 | 766
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (18) | (50)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 643 | 53
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (65) | (12)
Debt Securities, Available-for-sale, Unrealized Loss Position | 975 | 819
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (83) | (62)
Residential Agency [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 966 | 9,350
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (46) | (1,005)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,760 | 7,578
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,016) | (1,518)
Debt Securities, Available-for-sale, Unrealized Loss Position | 15,726 | 16,928
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (3,062) | (2,523)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 0 | 251
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (29)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 220 | 7
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (36) | (1)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 220 | 258
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (36) | (30)
Commercial Agency [Member] |  |
Unrealized Loss And Fair Value On Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 678 | 6,110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (52) | (400)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,480 | 1,503
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (724) | (249)
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,158 | 7,613
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (776) | (649)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 0 | 469
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (26)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 483 | 24
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (33) | (4)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 483 | 493
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (33) | (30)
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 | 0 | 141
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (8)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 78 | 45
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (15) | (4)
Debt Securities, Available-for-sale, Unrealized Loss Position | 78 | 186
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (15) | (12)
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 | 134 | 736
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) | (36)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 897 | 354
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (57) | (30)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,031 | 1,090
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (59) | $ (66)

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