Offsetting Arrangements - Repo, Sec Lending Transactions Maturity by Category (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 236,193	$ 243,596
Securities lending transactions	36,135	30,189
Gross amount of recognized liabilities for repurchase agreements and securities lending	272,328	273,785
U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	236,193	243,596
Securities lending transactions	383	175
Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	21	29
Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	22,125	14,495
Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	13,606	15,490
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	235,745	243,596
Securities lending transactions	33,794	26,973
Gross amount of recognized liabilities for repurchase agreements and securities lending	269,539	270,569
Overnight and Continuous \| U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	235,745	243,596
Securities lending transactions	383	175
Overnight and Continuous \| Corporate debt securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	21	29
Overnight and Continuous \| Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	19,784	11,279
Overnight and Continuous \| Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	13,606	15,490
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	448	0
Securities lending transactions	0	0
Gross amount of recognized liabilities for repurchase agreements and securities lending	448	0
Up to 30 Days \| U.S. Treasury and agency securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	448	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	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	1	1
Gross amount of recognized liabilities for repurchase agreements and securities lending	1	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	1	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	2,340	3,215
Gross amount of recognized liabilities for repurchase agreements and securities lending	2,340	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	2,340	3,215
Greater than 90 Days \| Other
Assets Sold under Agreements to Repurchase [Line Items]
Securities lending transactions	$ 0	$ 0