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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Consumer Loans That Were Modified for Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 737 | $ 377 | $ 1,100 | $ 526
Loan modification program, percentage of modifications to total portfolio | 0.41% | 0.31% | 0.59% | 0.43%
Consumer |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 10 | $ 10 | $ 21 | $ 20
Loan modification program, percentage of modifications to total portfolio | 0.03% | 0.03% | 0.06% | 0.07%
Consumer | Contractual Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 7 | $ 5 | $ 13 | $ 11
Consumer | Payment Delay |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 1 | 2 | 2 | 3
Consumer | Other |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 2 | 3 | 6 | 6
Consumer | Home equity |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 3 | $ 3 | $ 8 | $ 7
Loan modification program, percentage of modifications to total portfolio | 0.04% | 0.07% | 0.12% | 0.16%
Consumer | Home equity | Contractual Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 1 | $ 0 | $ 2 | $ 1
Consumer | Home equity | Payment Delay |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 0 | 0 | 0 | 0
Consumer | Home equity | Other |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 2 | 3 | 6 | 6
Consumer | Credit card |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 6 | $ 5 | $ 11 | $ 10
Loan modification program, percentage of modifications to total portfolio | 0.36% | 0.29% | 0.65% | 0.59%
Consumer | Credit card | Contractual Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 6 | $ 5 | $ 11 | $ 10
Consumer | Credit card | Payment Delay |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 0 | 0 | 0 | 0
Consumer | Credit card | Other |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 0 | 0 | 0 | 0
Consumer | Solar energy installation loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 0 | $ 1 | $ 1 | $ 1
Loan modification program, percentage of modifications to total portfolio | 0.00% | 0.02% | 0.02% | 0.02%
Consumer | Solar energy installation loans | Contractual Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 0 | $ 0 | $ 0 | $ 0
Consumer | Solar energy installation loans | Payment Delay |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 0 | 1 | 1 | 1
Consumer | Solar energy installation loans | Other |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 0 | 0 | 0 | 0
Consumer | Other consumer loans |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 1 | $ 1 | $ 1 | $ 2
Loan modification program, percentage of modifications to total portfolio | 0.04% | 0.04% | 0.04% | 0.08%
Consumer | Other consumer loans | Contractual Interest Rate Reduction |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 0 | $ 0 | $ 0 | $ 0
Consumer | Other consumer loans | Payment Delay |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 1 | 1 | 1 | 2
Consumer | Other consumer loans | Other |  |  |  |
Financing Receivable, Modifications |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 0 | $ 0 | $ 0 | $ 0

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