v3.19.3.a.u2
Discontinued Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net interest income $ 3,745 $ 3,735 $ 3,539
Non-interest income:      
Gain (Loss) on Disposition of Business 0 281 0
Total Noninterest Income 2,116 2,019 1,962
Non-interest expense:      
Salaries and employee benefits 1,916 1,947 1,874
Net occupancy expense 321 335 339
Furniture and equipment expense 325 325 326
Other 927 963 952
Total non-interest expense 3,489 3,570 3,491
Income from discontinued operations before income taxes 0 271 19
Income tax expense (benefit) 0 80 (3)
Income from discontinued operations, net of tax $ 0 $ 191 $ 22
Earnings per common share from discontinued operations:      
Basic $ 0.00 $ 0.18 $ 0.02
Diluted $ 0.00 $ 0.17 $ 0.02
Discontinued Operations [Member]      
Non-interest expense:      
Income from discontinued operations before income taxes $ 0 $ 271 $ 19
Income tax expense (benefit) 0 80 (3)
Income from discontinued operations, net of tax $ 0 $ 191 $ 22
Earnings per common share from discontinued operations:      
Basic $ 0.00 $ 0.18 $ 0.02
Diluted $ 0.00 $ 0.17 $ 0.02
Regions Insurance Group [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposal Group, Including Discontinued Operation, Interest Income   $ 1 $ 1
Disposal Group, Including Discontinued Operation, Interest Expense   0 0
Net interest income   1 1
Non-interest income:      
Gain (Loss) on Sale of Securities, Net (Excluding Trading Securities)   (1) 3
Insurance Commissions and Fees   69 140
Gain (Loss) on Disposition of Business   281 0
Other Non-Interest Income   0 3
Total Noninterest Income   349 146
Gain (Loss) on Disposition of Business, net of tax   196  
Non-interest expense:      
Salaries and employee benefits   49 96
Net occupancy expense   3 6
Furniture and equipment expense   2 4
Other   16 30
Total non-interest expense   70 136
Income from discontinued operations before income taxes   280 11
Income tax expense (benefit)   84 (5)
Income from discontinued operations, net of tax   $ 196 $ 16