Offsetting Arrangements - Repo, Sec Lending Transactions Maturity by Category (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 234,022	$ 227,222
Securities lending transactions	22,322	22,810
Gross amount of recognized liabilities for repurchase agreements and securities lending	256,344	250,032
U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	234,022	227,222
Securities lending transactions	161	152
Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	27	193
Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	11,579	15,713
Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	10,555	6,752
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	233,841	223,095
Securities lending transactions	20,575	18,278
Gross amount of recognized liabilities for repurchase agreements and securities lending	254,416	241,373
Overnight and Continuous \| U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	233,841	223,095
Securities lending transactions	161	152
Overnight and Continuous \| Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	27	193
Overnight and Continuous \| Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	9,832	11,181
Overnight and Continuous \| Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	10,555	6,752
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	350
Securities lending transactions	0	13
Gross amount of recognized liabilities for repurchase agreements and securities lending	0	363
Up to 30 Days \| U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	350
Securities lending transactions	0	0
Up to 30 Days \| Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
Up to 30 Days \| Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	13
Up to 30 Days \| Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
30-90 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	181	1,277
Securities lending transactions	0	0
Gross amount of recognized liabilities for repurchase agreements and securities lending	181	1,277
30-90 days \| U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	181	1,277
Securities lending transactions	0	0
30-90 days \| Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
30-90 days \| Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
30-90 days \| Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
Greater than 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	2,500
Securities lending transactions	1,747	4,519
Gross amount of recognized liabilities for repurchase agreements and securities lending	1,747	7,019
Greater than 90 Days \| U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	2,500
Securities lending transactions	0	0
Greater than 90 Days \| Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	0	0
Greater than 90 Days \| Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	1,747	4,519
Greater than 90 Days \| Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	$ 0	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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