Quarterly report pursuant to Section 13 or 15(d)

NONINTEREST INCOME - Disaggregation by Segment (Details)

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NONINTEREST INCOME - Disaggregation by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers $ 222 $ 227
Noninterest income within the scope of other GAAP topics 173 134
Noninterest income 395 361
Mortgage banking income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 69 87
Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 62 56
Card and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 52 47
Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 27 23
Other noninterest income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 12 14
Operating Segments | Consumer & Business Banking    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 137 146
Noninterest income within the scope of other GAAP topics 99 66
Noninterest income 236 212
Operating Segments | Consumer & Business Banking | Mortgage banking income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 48 68
Operating Segments | Consumer & Business Banking | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 58 52
Operating Segments | Consumer & Business Banking | Card and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 13 10
Operating Segments | Consumer & Business Banking | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 12 8
Operating Segments | Consumer & Business Banking | Other noninterest income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 6 8
Operating Segments | Commercial Banking    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 28 27
Noninterest income within the scope of other GAAP topics 60 59
Noninterest income 88 86
Operating Segments | Commercial Banking | Mortgage banking income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 19 17
Operating Segments | Commercial Banking | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 4 4
Operating Segments | Commercial Banking | Card and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1 1
Operating Segments | Commercial Banking | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 2 2
Operating Segments | Commercial Banking | Other noninterest income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 2 3
Operating Segments | Vehicle Finance    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 3 2
Noninterest income within the scope of other GAAP topics 0 1
Noninterest income 3 3
Operating Segments | Vehicle Finance | Mortgage banking income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 2 1
Operating Segments | Vehicle Finance | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0 0
Operating Segments | Vehicle Finance | Card and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0 0
Operating Segments | Vehicle Finance | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0 0
Operating Segments | Vehicle Finance | Other noninterest income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1 1
Operating Segments | RBPCG    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 52 50
Noninterest income within the scope of other GAAP topics 1 0
Noninterest income 53 50
Operating Segments | RBPCG | Mortgage banking income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0 1
Operating Segments | RBPCG | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0 0
Operating Segments | RBPCG | Card and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 38 36
Operating Segments | RBPCG | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 13 12
Operating Segments | RBPCG | Other noninterest income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1 1
Treasury / Other    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 2 2
Noninterest income within the scope of other GAAP topics 13 8
Noninterest income 15 10
Treasury / Other | Mortgage banking income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0 0
Treasury / Other | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0 0
Treasury / Other | Card and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0 0
Treasury / Other | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0 1
Treasury / Other | Other noninterest income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers $ 2 $ 1