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Debt Securities (Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Securities Available For Sale) (Details) - USD ($) $ in Millions | Mar. 31, 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 | $ 6,444 | $ 17,379
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (247) | (1,507)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 20,661 | 10,436
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,748) | (1,928)
Debt Securities, Available-for-sale, Unrealized Loss Position | 27,105 | 27,815
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,995) | (3,435)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 457 | 720
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (20) | (55)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 291 | 31
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (31) | (5)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 748 | 751
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (51) | (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 | 250 | 276
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) | (8)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 950 | 903
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (100) | (115)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,200 | 1,179
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (102) | (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 | 51 | 766
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | (50)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 650 | 53
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (48) | (12)
Debt Securities, Available-for-sale, Unrealized Loss Position | 701 | 819
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (49) | (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 | 2,189 | 9,350
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (84) | (1,005)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,734 | 7,578
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,161) | (1,518)
Debt Securities, Available-for-sale, Unrealized Loss Position | 16,923 | 16,928
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,245) | (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 | 253 | 7
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (25) | (1)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 253 | 258
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (25) | (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 | 3,533 | 6,110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (145) | (400)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,608 | 1,503
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (392) | (249)
Debt Securities, Available-for-sale, Unrealized Loss Position | 7,141 | 7,613
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (537) | (649)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Estimated Fair Value | 457 | 469
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (20) | (26)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Estimated Fair Value | 38 | 24
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (6) | (4)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 495 | 493
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (26) | (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 | 58 | 141
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6) | (8)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 65 | 45
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5) | (4)
Debt Securities, Available-for-sale, Unrealized Loss Position | 123 | 186
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (11) | (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 | 363 | 736
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (9) | (36)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 654 | 354
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (42) | (30)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,017 | 1,090
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (51) | $ (66)

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