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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

3 Months Ended

12 Months Ended

Dec. 31, 2021

Sep. 30, 2021

Jun. 30, 2021

Mar. 31, 2021

Dec. 31, 2020

^[1]

Sep. 30, 2020

^[1]

Jun. 30, 2020

^[1]

Mar. 31, 2020

^[1]

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Tax based on federal statutory rate, amount

$ 313

$ 130

$ 323

Tax based on federal statutory rate, percent

21.00%

21.00%

21.00%

State income tax, amount

$ 35

$ 18

$ 34

State income tax, percent

2.40%

2.90%

2.20%

Affordable housing and historic credits, amount

$ (13)

$ (12)

$ (11)

Affordable housing and historic credits, amount, rate

(0.90%)

(1.90%)

(0.70%)

Bank-owned life insurance, amount

$ (10)

$ (10)

$ (9)

Bank-owned life insurance, percent

(0.60%)

(1.60%)

(0.60%)

FDIC insurance expense, amount

$ 5

$ 7

$ 5

FDIC insurance expense, rate

0.30%

1.10%

0.30%

Employee Stock Transactions, amount

$ (3)

$ (1)

$ (12)

Employee Stock Transactions, percent

(0.20%)

(0.20%)

(0.80%)

Tax-related interest and penalties, amount

$ 0

$ (2)

$ 2

Tax-related interest and penalties, percent

0.00%

(0.30%)

0.10%

Other, amount

$ (5)

$ (6)

$ 4

Other, percent

(0.40%)

(1.00%)

0.30%

Provision (benefit) for income taxes

$ 61

$ 70

$ 93

$ 98

$ 65

$ 50

$ 28

$ (19)

$ 322

$ 124

^[2]

$ 336

^[2]

Provision for income taxes, percent

21.60%

20.00%

21.80%

[1]	Recast to reflect the retrospective application of the Corporation's election to change the accounting methodology for certain components of defined pension benefit credit. Refer to Note 1 for further information.
[2]	See Defined Benefit Pension and Other Postretirement Costs in Note 1.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the interest on income tax liabilities.

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