Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities - Investments in Community Development and Tax-advantaged VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Variable Interest Entity [Line Items]
Investment carrying amount	$ 725,918	$ 692,345
Unfunded capital and other commitments	658,023	626,694
Variable Interest Entity, Not Primary Beneficiary, Community Development and Tax-Advantaged Investments
Variable Interest Entity [Line Items]
Investment carrying amount	9,774	9,712
Unfunded capital and other commitments	5,630	5,761
Maximum exposure to loss	$ 10,080	$ 9,338

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

Amount of liability recognized for present obligation requiring transfer or otherwise providing economic benefit to others.

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