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Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Equity, Beginning Balance | [1] | $ 45,812.0 |  | $ 55,726.0 |  | $ 54,041.0
Other comprehensive income (loss), net of tax |  | 2,460.0 |  | (10,581.0) |  | (2,361.0)
Equity, Ending Balance | [1] | 51,141.0 |  | 45,812.0 |  | 55,726.0
Pretax loss from derivatives |  | 293.0 |  | 314.0 |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Equity, Beginning Balance | [1] | (10,172.0) | [2] | 409.0 |  | 2,770.0
Other comprehensive income (loss), net of tax |  | 2,460.0 |  | (10,581.0) |  | (2,361.0)
Equity, Ending Balance | [1] | (7,712.0) | [2] | (10,172.0) | [2] | 409.0
Debt securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Equity, Beginning Balance |  | (7,164.0) | [2] | 589.0 |  | 2,462.0
Other comprehensive income (loss), net of tax |  | 1,334.0 |  | (7,753.0) |  | (1,873.0)
Equity, Ending Balance |  | (5,830.0) | [2] | (7,164.0) | [2] | 589.0
Cash flow hedge derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Equity, Beginning Balance |  | (2,705.0) | [2] | (201.0) |  | 659.0
Other comprehensive income (loss), net of tax |  | 992.0 |  | (2,504.0) |  | (860.0)
Equity, Ending Balance |  | (1,713.0) | [2] | (2,705.0) | [2] | (201.0)
Pension and other postretirement benefit plan adjustments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Equity, Beginning Balance |  | (251.0) | [2] | 27.0 |  | (345.0)
Other comprehensive income (loss), net of tax |  | 126.0 |  | (278.0) |  | 372.0
Equity, Ending Balance |  | (125.0) | [2] | (251.0) | [2] | 27.0
Other |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Equity, Beginning Balance |  | (52.0) | [2] | (6.0) |  | (6.0)
Other comprehensive income (loss), net of tax |  | 8.0 |  | (46.0) |  |
Equity, Ending Balance |  | $ (44.0) | [2] | $ (52.0) | [2] | $ (6.0)
[1] | The par value of our preferred stock outstanding was less than $0.5 million at each date and, therefore, is excluded from this presentation.
[2] | AOCI included pretax losses of $293 million and $314 million from derivatives that hedged the purchase of investment securities classified as held to maturity at December 31, 2023 and December 31, 2022, respectively.

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