Offsetting Arrangements - Repo, Sec Lending Transactions Maturity by Category (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 180,754	$ 101,801
Securities lending transactions	16,453	9,852
Gross amount of recognized liabilities for repurchase agreements and securities lending	197,207	111,653
U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	180,371	101,099
Securities lending transactions	3	44
Non-U.S. sovereign debt
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	383	702
Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	92	67
Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	10,032	6,115
Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	6,326	3,626
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	180,561	101,601
Securities lending transactions	13,495	8,246
Gross amount of recognized liabilities for repurchase agreements and securities lending	194,056	109,847
Overnight and Continuous | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	180,178	100,899
Securities lending transactions	3	44
Overnight and Continuous | Non-U.S. sovereign debt
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	383	702
Overnight and Continuous | Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	85	67
Overnight and Continuous | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	7,081	4,509
Overnight and Continuous | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	6,326	3,626
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	193	0
Securities lending transactions	15	0
Gross amount of recognized liabilities for repurchase agreements and securities lending	208	0
Up to 30 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	193	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	15	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	0	200
Securities lending transactions	34	0
Gross amount of recognized liabilities for repurchase agreements and securities lending	34	200
30-90 days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	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	7	0
30-90 days | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	27	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	2,909	1,606
Gross amount of recognized liabilities for repurchase agreements and securities lending	2,909	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	2,909	1,606
Greater than 90 Days | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	$ 0	$ 0