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Securities - Debt Securities, Held-to-maturity, Credit Quality Indicator (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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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Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain (Loss)

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
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Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

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-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-Publisher FASB
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