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Business Segment Information
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Business Segment Information
Each of Regions’ reportable segments is a strategic business unit that serves specific needs of Regions’ customers based on the products and services provided. The segments are based on the manner in which management views the financial performance of the business. The Company has three reportable segments: Corporate Bank, Consumer Bank, and Wealth Management, with the remainder in Other.
The application and development of management reporting methodologies is a dynamic process and is subject to periodic enhancements. As these enhancements are made, financial results presented by each reportable segment may be periodically revised. Accordingly, the prior periods were updated to reflect these enhancements. In the first quarter of 2021, the net interest income allocation methodology was enhanced. All net interest income including the FTP offset, activities of the treasury function, securities portfolio and interest rate risk activities is allocated to the three reporting segments.
The Corporate Bank segment represents the Company’s commercial banking functions including commercial and industrial, commercial real estate and investor real estate lending. This segment also includes equipment lease financing, as well as capital markets activities, which include securities underwriting and placement, loan syndication and placement, foreign exchange, derivatives, merger and acquisition and other advisory services. Corporate Bank customers include corporate, middle market, and commercial real estate developers and investors. Corresponding deposit products related to these types of customers are also included in this segment.
The Consumer Bank segment represents the Company’s branch network, including consumer banking products and services related to residential first mortgages, home equity lines and loans, consumer credit cards and other consumer loans, as well as the corresponding deposit relationships. These services are also provided through the Company's digital channels and contact center.
The Wealth Management segment offers individuals, businesses, governmental institutions and non-profit entities a wide range of solutions to help protect, grow and transfer wealth. Offerings include credit related products, trust and investment management, asset management, retirement and savings solutions and estate planning.
Other includes the Company’s Treasury function, the securities portfolio, wholesale funding activities, interest rate risk management activities and other corporate functions that are not related to a strategic business unit. Also within Other are certain reconciling items in order to translate the segment results that are based on management accounting practices into consolidated results. Management accounting practices utilized by Regions as the basis of presentation for segment results include the following:
•Net interest income is presented based upon an FTP approach, for which market-based funding charges/credits are assigned within the segments. By allocating a cost or a credit to each product based on the FTP framework, management is able to more effectively measure the net interest margin contribution of its assets/liabilities by segment. The summation of the interest income/expense and FTP charges/credits for each segment is its designated net interest income.
•Provision for (benefit from) credit losses is allocated to each segment based on an estimated loss methodology. The difference between the consolidated provision for (benefit from) credit losses and the segments’ estimated loss is reflected in Other.
•Income tax expense (benefit) is calculated for the Corporate Bank, Consumer Bank and Wealth Management based on a consistent federal and state statutory rate. Any difference between the Company’s consolidated income tax expense (benefit) and the segments’ calculated amounts is reflected in Other.
•Management reporting allocations of certain expenses are made in order to analyze the financial performance of the segments. These allocations consist of operational and overhead cost pools and are intended to represent the total costs to support a segment.
The following tables present financial information for each reportable segment for the year ended December 31:
 2021
 Corporate BankConsumer
Bank		Wealth
Management		OtherConsolidated
 (In millions)
Net interest income $1,762 $2,013 $139 $— $3,914 
Provision for (benefit from) credit losses (1)
303 254 10 (1,091)(524)
Non-interest income752 1,266 390 116 2,524 
Non-interest expense1,091 2,173 387 96 3,747 
Income before income taxes1,120 852 132 1,111 3,215 
Income tax expense 280 213 33 168 694 
Net income $840 $639 $99 $943 $2,521 
Average assets$59,132 $34,309 $2,046 $58,782 $154,269 
2020
 Corporate BankConsumer
Bank		Wealth
Management		OtherConsolidated
 (In millions)
Net interest income$1,688 $2,066 $140 $— $3,894 
Provision for credit losses (1)
290 305 11 724 1,330 
Non-interest income656 1,267 344 126 2,393 
Non-interest expense1,024 2,057 346 216 3,643 
Income (loss) before income taxes1,030 971 127 (814)1,314 
Income tax expense (benefit)257 242 32 (311)220 
Net income (loss)$773 $729 $95 $(503)$1,094 
Average assets$61,218 $34,530 $2,021 $40,326 $138,095 
 2019
 Corporate BankConsumer
Bank		Wealth
Management		OtherConsolidated
 (In millions)
Net interest income $1,395 $2,184 $166 $— $3,745 
Provision for (benefit from) credit losses (1)
192 320 13 (138)387 
Non-interest income538 1,215 331 32 2,116 
Non-interest expense938 2,121 342 88 3,489 
Income before income taxes803 958 142 82 1,985 
Income tax expense (benefit)201 240 36 (74)403 
Net income $602 $718 $106 $156 $1,582 
Average assets$53,846 $35,063 $2,183 $34,018 $125,110 
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(1)Upon adoption of CECL on January 1, 2020, the provision for credit losses is the sum of the provision for loans losses and the provision for unfunded credit commitments. Prior to the adoption of CECL, the provision for unfunded commitments was included in other non-interest expense.