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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
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Tax based on federal statutory rate, amount $ 186 $ 240 $ 310
Tax based on federal statutory rate, percent 21.00% 21.00% 21.00%
State income tax, amount $ 10 $ 35 $ 36
State income tax, percent 1.10% 3.10% 2.50%
Affordable housing and historic credits, amount $ (15) $ (16) $ (13)
Affordable housing and historic credits, percent (1.70%) (1.40%) (0.90%)
Bank-owned life insurance, amount $ (8) $ (10) $ (10)
Bank-owned life insurance, percent (0.90%) (0.90%) (0.70%)
FDIC fees, amount $ 13 $ 15 $ 6
FDIC fees, percent 1.50% 1.30% 0.40%
Employee Stock Transactions, amount $ 1 $ (1) $ (3)
Employee Stock Transactions, percent 0.20% (0.10%) (0.20%)
Tax-related interest and penalties, amount $ 0 $ (4) $ 0
Tax-related interest and penalties, percent 0.00% (0.40%) 0.00%
Other, amount $ 3 $ 4 $ (1)
Other, percent 0.40% 0.40% (0.10%)
Provision for income taxes, amount $ 190 $ 263 $ 325
Provision for income taxes, percent 21.60% 23.00% 22.00%