Offsetting Arrangements - Repo, Sec Lending Transactions Maturity by Category (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 210,622	$ 197,757
Securities lending transactions	19,887	16,605
Gross amount of recognized liabilities for repurchase agreements and securities lending	230,509	214,362
U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	210,622	197,757
Securities lending transactions	1	6
Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	217	281
Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	12,923	9,452
Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	6,746	6,866
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	207,768	196,212
Securities lending transactions	16,650	14,278
Gross amount of recognized liabilities for repurchase agreements and securities lending	224,418	210,490
Overnight and Continuous | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	207,768	196,212
Securities lending transactions	1	6
Overnight and Continuous | Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	215	278
Overnight and Continuous | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	9,688	7,128
Overnight and Continuous | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	6,746	6,866
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	790	0
Securities lending transactions	15	20
Gross amount of recognized liabilities for repurchase agreements and securities lending	805	20
Up to 30 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	790	0
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	15	20
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	231	185
Securities lending transactions	7	16
Gross amount of recognized liabilities for repurchase agreements and securities lending	238	201
30-90 days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	231	185
Securities lending transactions	0	0
30-90 days | Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	2	3
30-90 days | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	5	13
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	1,833	1,360
Securities lending transactions	3,215	2,291
Gross amount of recognized liabilities for repurchase agreements and securities lending	5,048	3,651
Greater than 90 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	1,833	1,360
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	3,215	2,291
Greater than 90 Days | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	$ 0	$ 0