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Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Total Equity, Beginning Balance | [1] | $ 55,726.0 |  | $ 54,041.0 | $ 49,343.0
Other comprehensive income, net of tax |  | (10,581.0) |  | (2,361.0) | 1,971.0
Total Equity, Ending Balance | [1] | 45,812.0 |  | 55,726.0 | 54,041.0
Pretax loss from derivatives |  | (314.0) |  |  |
Continuing Operations |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other comprehensive income, net of tax |  | (10,581.0) |  | (2,361.0) | 1,856.0
Discontinued Operations |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other comprehensive income, net of tax |  |  |  |  | 115.0
Debt securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Total Equity, Beginning Balance |  | 589.0 |  | 2,462.0 | 1,067.0
Cumulative effect of adopting ASU 2018-02 |  |  |  |  | 1,395.0
Other comprehensive income, net of tax |  | (7,753.0) |  | (1,873.0) |
Total Equity, Ending Balance |  | (7,164.0) | [2] | 589.0 | 2,462.0
Cash flow hedge derivatives |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Total Equity, Beginning Balance |  | (201.0) |  | 659.0 | 276.0
Cumulative effect of adopting ASU 2018-02 |  |  |  |  | 383.0
Other comprehensive income, net of tax |  | (2,504.0) |  | (860.0) |
Total Equity, Ending Balance |  | (2,705.0) | [2] | (201.0) | 659.0
Pension and other postretirement benefit plan adjustments |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Total Equity, Beginning Balance |  | 27.0 |  | (345.0) | (408.0)
Cumulative effect of adopting ASU 2018-02 |  |  |  |  | 63.0
Other comprehensive income, net of tax |  | (278.0) |  | 372.0 |
Total Equity, Ending Balance |  | (251.0) | [2] | 27.0 | (345.0)
Other |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Total Equity, Beginning Balance |  | (6.0) |  | (6.0) | (21.0)
Cumulative effect of adopting ASU 2018-02 |  |  |  |  | 15.0
Other comprehensive income, net of tax |  | (46.0) |  |  |
Total Equity, Ending Balance |  | (52.0) | [2] | (6.0) | (6.0)
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Total Equity, Beginning Balance | [1] | 409.0 |  | 2,770.0 | 799.0
Cumulative effect of adopting ASU 2018-02 |  |  |  |  | 1,971.0
Other comprehensive income, net of tax |  | (10,581.0) |  | (2,361.0) | 1,971.0
Total Equity, Ending Balance | [1] | (10,172.0) | [2] | 409.0 | 2,770.0
Accumulated Other Comprehensive Income (Loss) | Continuing Operations |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Total Equity, Beginning Balance |  | 409.0 |  | 2,770.0 | 914.0
Cumulative effect of adopting ASU 2018-02 |  |  |  |  | 1,856.0
Other comprehensive income, net of tax |  | (10,581.0) |  | (2,361.0) |
Total Equity, Ending Balance |  | (10,172.0) | [2] | 409.0 | 2,770.0
Accumulated Other Comprehensive Income (Loss) | Discontinued Operations |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Total Equity, Beginning Balance |  |  |  |  | (115.0)
Cumulative effect of adopting ASU 2018-02 |  |  |  |  | 115.0
Other comprehensive income, net of tax |  |  |  |  |
Total Equity, Ending Balance |  |  | [2] |  |
[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] | At December 31, 2022, AOCI included pretax losses of $314 million from derivatives that hedged the purchase of investment securities classified as held to maturity.

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