Offsetting Arrangements - Repo, Sec Lending Transactions Maturity by Category (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 225,488	$ 243,596
Securities lending transactions	35,065	30,189
Gross amount of recognized liabilities for repurchase agreements and securities lending	260,553	273,785
U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	225,488	243,596
Securities lending transactions	309	175
Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	29	29
Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	18,285	14,495
Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	16,442	15,490
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	224,285	243,596
Securities lending transactions	32,700	26,973
Gross amount of recognized liabilities for repurchase agreements and securities lending	256,985	270,569
Overnight and Continuous | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	224,285	243,596
Securities lending transactions	254	175
Overnight and Continuous | Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	29	29
Overnight and Continuous | Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	15,975	11,279
Overnight and Continuous | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	16,442	15,490
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	1,203	0
Securities lending transactions	55	0
Gross amount of recognized liabilities for repurchase agreements and securities lending	1,258	0
Up to 30 Days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	1,203	0
Securities lending transactions	55	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	0	0
Securities lending transactions	25	1
Gross amount of recognized liabilities for repurchase agreements and securities lending	25	1
30-90 days | U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
Securities lending transactions	0	0
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	25	1
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	2,285	3,215
Gross amount of recognized liabilities for repurchase agreements and securities lending	2,285	3,215
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 | 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	2,285	3,215
Greater than 90 Days | Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	$ 0	$ 0