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Income Taxes And Tax-Related Items Reconciliation of Expected Income Tax Expense at the Federal Statutory Rate to the Corporation's Provision for Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Tax based on federal statutory rate, amount | $ 310 | $ 313 | $ 130
Tax based on federal statutory rate, percent | 21.00% | 21.00% | 21.00%
State income taxes, amount | $ 36 | $ 35 | $ 18
State income taxes, percent | 2.50% | 2.40% | 2.90%
Affordable housing and historic credits, amount | $ (13) | $ (13) | $ (12)
Affordable housing and historic credits, percent | (0.90%) | (0.90%) | (1.90%)
Bank-owned life insurance, amount | $ (10) | $ (10) | $ (10)
Bank-owned life insurance, percent | (0.70%) | (0.60%) | (1.60%)
FDIC insurance expense, amount | $ 6 | $ 5 | $ 7
FDIC insurance expense, percent | 0.40% | 0.30% | 1.10%
Employee Stock Transactions, amount | $ (3) | $ (3) | $ (1)
Employee Stock Transactions, percent | (0.20%) | (0.20%) | (0.20%)
Tax-related interest and penalties, amount | $ 0 | $ 0 | $ (2)
Tax-related interest and penalties, percent | 0.00% | 0.00% | (0.30%)
Other, amount | $ (1) | $ (5) | $ (6)
Other, percent | (0.10%) | (0.40%) | (1.00%)
Provision for income taxes, amount | $ 325 | $ 322 | $ 124
Provision for income taxes, percent | 22.00% | 21.60% | 20.00%

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- Definition The tax effects percentage of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity. + References No definition available. + Details
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- Definition The portion of the difference between total income tax expense (benefit) as reported in the Income Statement for the period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to interest on income tax liabilities. + References No definition available. + Details
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