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Fair value measurement - Certain Items on Recurring Basis (Details) - Measured at fair value on a recurring basis - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Non-agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 1,407	$ 1,478
Non-agency RMBS | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	98.00%
Non-agency RMBS | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	2.00%
Non-agency RMBS | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency RMBS | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency RMBS | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency RMBS | 2008-2025
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 1,401	$ 1,453
Non-agency RMBS | 2008-2025 | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	98.00%
Non-agency RMBS | 2008-2025 | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	2.00%
Non-agency RMBS | 2008-2025 | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency RMBS | 2008-2025 | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency RMBS | 2008-2025 | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency RMBS | 2007 and earlier
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 6	$ 25
Non-agency RMBS | 2007 and earlier | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency RMBS | 2007 and earlier | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-agency RMBS | 2007 and earlier | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency RMBS | 2007 and earlier | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency RMBS | 2007 and earlier | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency commercial MBS | 2009-2025 | Domestic
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 2,210	$ 2,487
Non-agency commercial MBS | 2009-2025 | AAA/ AA- | Domestic
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-agency commercial MBS | 2009-2025 | A/ A- | Domestic
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency commercial MBS | 2009-2025 | BBB/ BBB- | Domestic
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency commercial MBS | 2009-2025 | BB and lower | Domestic
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-agency commercial MBS | 2009-2025 | Not Rated | Domestic
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 7,762	$ 7,068
Foreign covered bonds | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Foreign covered bonds | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Canada
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 1,932	$ 2,113
Foreign covered bonds | Canada | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Foreign covered bonds | Canada | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Canada | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Canada | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Canada | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | UK
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 1,011	$ 911
Foreign covered bonds | UK | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Foreign covered bonds | UK | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | UK | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | UK | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | UK | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Germany
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 743	$ 598
Foreign covered bonds | Germany | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Foreign covered bonds | Germany | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Germany | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Germany | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Germany | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Australia
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 778	$ 574
Foreign covered bonds | Australia | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Foreign covered bonds | Australia | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Australia | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Australia | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Australia | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Singapore
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 596	$ 554
Foreign covered bonds | Singapore | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Foreign covered bonds | Singapore | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Singapore | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Singapore | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Singapore | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Netherlands
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 531	$ 465
Foreign covered bonds | Netherlands | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Foreign covered bonds | Netherlands | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Netherlands | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Netherlands | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Netherlands | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 2,171	$ 1,853
Foreign covered bonds | Other | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Foreign covered bonds | Other | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Other | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Other | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Foreign covered bonds | Other | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Canada
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 1,880	$ 1,463
Non-U.S. government | Canada | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	90.00%	100.00%
Non-U.S. government | Canada | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	10.00%	0.00%
Non-U.S. government | Canada | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Canada | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Canada | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | UK
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 4,395	$ 3,383
Non-U.S. government | UK | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-U.S. government | UK | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | UK | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | UK | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | UK | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Germany
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 2,094	$ 2,308
Non-U.S. government | Germany | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-U.S. government | Germany | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Germany | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Germany | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Germany | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Netherlands
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 1,823	$ 705
Non-U.S. government | Netherlands | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-U.S. government | Netherlands | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Netherlands | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Netherlands | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Netherlands | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 1,542	$ 1,536
Non-U.S. government | Other | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	56.00%	68.00%
Non-U.S. government | Other | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	32.00%	19.00%
Non-U.S. government | Other | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	3.00%	4.00%
Non-U.S. government | Other | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	9.00%	9.00%
Non-U.S. government | Other | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | France
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 2,288	$ 1,732
Non-U.S. government | France | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-U.S. government | France | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | France | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | France | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | France | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Austria
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 743	$ 388
Non-U.S. government | Austria | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-U.S. government | Austria | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Austria | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Austria | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Austria | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Finland
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 716	$ 527
Non-U.S. government | Finland | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-U.S. government | Finland | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Finland | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Finland | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Finland | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Spain
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 629	$ 617
Non-U.S. government | Spain | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Spain | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	2.00%
Non-U.S. government | Spain | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	98.00%
Non-U.S. government | Spain | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Spain | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Japan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 464	$ 377
Non-U.S. government | Japan | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Japan | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-U.S. government | Japan | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Japan | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Japan | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Belgium
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 362	$ 728
Non-U.S. government | Belgium | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Non-U.S. government | Belgium | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Belgium | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Belgium | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Belgium | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Non-U.S. government | Sovereign debt/sovereign guaranteed | Brazil | Carrying amount
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 139	$ 135
Supranational
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 11,559	$ 10,983
Supranational | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	100.00%	100.00%
Supranational | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Supranational | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Supranational | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Supranational | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%
Total non-U.S. government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total carrying value	$ 28,495	$ 24,747
Total non-U.S. government | AAA/ AA-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	93.00%	94.00%
Total non-U.S. government | A/ A-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	6.00%	3.00%
Total non-U.S. government | BBB/ BBB-
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	3.00%
Total non-U.S. government | BB and lower
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	1.00%	0.00%
Total non-U.S. government | Not Rated
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Ratings	0.00%	0.00%

X

- Definition

Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]

+ References

No definition available.

+ Details

Name:	bk_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems
Namespace Prefix:	bk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of total fair value

+ References

No definition available.

+ Details

Name:	bk_PercentageOfTotalFairValue
Namespace Prefix:	bk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
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-Paragraph 2E
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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