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Securities - Debt Securities, Held-to-maturity, Credit Quality Indicator (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount | $ 49,539 | $ 48,596
Unrealized gain (loss) | $ (3,025) | $ (4,576)
Ratings (percent) | 0.00% | 0.00%
Agency residential mortgage-backed securities (“RMBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount | $ 26,439 | $ 25,824
Unrealized gain (loss) | $ (2,492) | $ (3,541)
Ratings (percent) | 0.00% | 0.00%
U.S. Treasury |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount | $ 8,818 | $ 8,833
Unrealized gain (loss) | $ (205) | $ (443)
Ratings (percent) | 0.00% | 0.00%
Non-U.S. government |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount | $ 5,815 | $ 4,479
Unrealized gain (loss) | $ 4 | $ (28)
Ratings (percent) | 0.00% | 0.00%
U.S. government agencies |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount | $ 2,734 | $ 3,669
Unrealized gain (loss) | $ (199) | $ (322)
Ratings (percent) | 0.00% | 0.00%
Agency commercial mortgage-backed securities (“MBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount | $ 3,017 | $ 3,395
Unrealized gain (loss) | $ (136) | $ (243)
Ratings (percent) | 0.00% | 0.00%
Collateralized loan obligations (“CLOs”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount | $ 1,971 | $ 1,816
Unrealized gain (loss) | $ 1 | $ 2
Ratings (percent) | 0.00% | 0.00%
Foreign covered bonds |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount | $ 734 | $ 555
Unrealized gain (loss) | $ 3 | $ 0
Ratings (percent) | 0.00% | 0.00%
Non-agency RMBS |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount |  | $ 14
Unrealized gain (loss) |  | $ 0
Ratings (percent) |  | 0.00%
Other debt securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Available-for-sale, amount | $ 11 | $ 11
Unrealized gain (loss) | $ (1) | $ (1)
Ratings (percent) | 100.00% | 100.00%
AAA/ AA- |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 100.00% | 100.00%
AAA/ AA- | Agency residential mortgage-backed securities (“RMBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 100.00% | 100.00%
AAA/ AA- | U.S. Treasury |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 100.00% | 100.00%
AAA/ AA- | Non-U.S. government |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 100.00% | 100.00%
AAA/ AA- | U.S. government agencies |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 100.00% | 100.00%
AAA/ AA- | Agency commercial mortgage-backed securities (“MBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 100.00% | 100.00%
AAA/ AA- | Collateralized loan obligations (“CLOs”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 100.00% | 100.00%
AAA/ AA- | Foreign covered bonds |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 100.00% | 100.00%
AAA/ AA- | Non-agency RMBS |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) |  | 23.00%
AAA/ AA- | Other debt securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
A+/ A- |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
A+/ A- | Agency residential mortgage-backed securities (“RMBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
A+/ A- | U.S. Treasury |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
A+/ A- | Non-U.S. government |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
A+/ A- | U.S. government agencies |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
A+/ A- | Agency commercial mortgage-backed securities (“MBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
A+/ A- | Collateralized loan obligations (“CLOs”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
A+/ A- | Foreign covered bonds |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
A+/ A- | Non-agency RMBS |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) |  | 77.00%
A+/ A- | Other debt securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BBB+/ BBB- |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BBB+/ BBB- | Agency residential mortgage-backed securities (“RMBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BBB+/ BBB- | U.S. Treasury |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BBB+/ BBB- | Non-U.S. government |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BBB+/ BBB- | U.S. government agencies |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BBB+/ BBB- | Agency commercial mortgage-backed securities (“MBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BBB+/ BBB- | Collateralized loan obligations (“CLOs”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BBB+/ BBB- | Foreign covered bonds |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BBB+/ BBB- | Non-agency RMBS |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) |  | 0.00%
BBB+/ BBB- | Other debt securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BB+ and lower |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BB+ and lower | Agency residential mortgage-backed securities (“RMBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BB+ and lower | U.S. Treasury |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BB+ and lower | Non-U.S. government |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BB+ and lower | U.S. government agencies |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BB+ and lower | Agency commercial mortgage-backed securities (“MBS”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BB+ and lower | Collateralized loan obligations (“CLOs”) |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BB+ and lower | Foreign covered bonds |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%
BB+ and lower | Non-agency RMBS |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) |  | 0.00%
BB+ and lower | Other debt securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Ratings (percent) | 0.00% | 0.00%

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