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Income Taxes (Summary Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Deferred Tax Assets [Abstract]    
Allowance for loan losses [1] $ 573 $ 400
Deferred tax asset, right of use liability 137 132
State net operating carryforwards, net of federal tax effect 58 53 [2]
Accrued expenses 35 32
Other 13 15
Total deferred tax assets 816 632
Deferred Tax Assets, Valuation Allowance (31) (29)
Total deferred tax assets less valuation allowance 785 603
Deferred Tax Liabilities [Abstract]    
Lease financing 413 369
Deferred Tax Liabilities, Right of use asset 128 123
Goodwill and intangibles 106 100
unrealized gains included in shareholder's equity' deferred tax liability 444 98
Mortgage servicing rights 45 78
Fixed assets 54 67
Employee benefits and deferred compensation 54 31
Other 46 43
Total deferred tax liabilities 1,290 909
Deferred Tax Liabilities, Net (505) (306)
Income Tax Contingency [Line Items]    
State net operating carryforwards, net of federal tax effect 58 $ 53 [2]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle $ 126  
[1] Regions adopted CECL on January 1, 2020 and the impact resulted in an increase of $126 million in deferred tax assets. Prior to adoption, the deferred tax assets impact is for the allowance for loan losses.
[2] Federal and state deferred tax assets of $21 million and $1 million, respectively, related to net operating losses were acquired as part of the Company’s April 2020 equipment finance acquisition and the December 2021 commercial real estate lender acquisition. While the federal and certain state net operating losses may be subject to certain annual utilization limits, the Company has determined that a valuation allowance is not necessary based on projected annual limitation and the length of the net operating loss carryover period.