Offsetting Arrangements - Repo, Sec Lending Transactions Maturity by Category (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 190,014	$ 101,801
Securities lending transactions	13,431	9,852
Gross amount of recognized liabilities for repurchase agreements and securities lending	203,445	111,653
U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	189,678	101,099
Securities lending transactions	8	44
Non-U.S. sovereign debt
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	336	702
Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	121	67
Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	9,676	6,115
Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	3,626	3,626
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	189,817	101,601
Securities lending transactions	10,369	8,246
Gross amount of recognized liabilities for repurchase agreements and securities lending	200,186	109,847
Overnight and Continuous | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	189,481	100,899
Securities lending transactions	8	44
Overnight and Continuous | Non-U.S. sovereign debt
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	336	702
Overnight and Continuous | Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	121	67
Overnight and Continuous | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	6,614	4,509
Overnight and Continuous | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	3,626	3,626
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	0	0
Gross amount of recognized liabilities for repurchase agreements and securities lending	0	0
Up to 30 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	0	0
Up to 30 Days | Non-U.S. sovereign debt
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	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	0
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	197	200
Securities lending transactions	1	0
Gross amount of recognized liabilities for repurchase agreements and securities lending	198	200
30-90 days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	197	200
Securities lending transactions	0	0
30-90 days | Non-U.S. sovereign debt
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	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	1	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	0
Securities lending transactions	3,061	1,606
Gross amount of recognized liabilities for repurchase agreements and securities lending	3,061	1,606
Greater than 90 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	0	0
Greater than 90 Days | Non-U.S. sovereign debt
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	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	3,061	1,606
Greater than 90 Days | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	$ 0	$ 0