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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Recorded Investment in Retail Loans by Delinquency Status (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 1,096 | $ 1,456
Total | 113,407 | 110,617
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 361 | 501
Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 166 | 163
Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 569 | 792
Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 55,820 | 55,195
Past Due | 899 | 1,090
Total | 58,519 | 58,586
Retail | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 17,557 | 16,714
Past Due | 153 | 184
Total | 17,814 | 17,045
Retail | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,083 | 1,212
Past Due | 55 | 78
Total | 1,211 | 1,392
Retail | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 12,397 | 12,756
Past Due | 256 | 289
Total | 13,014 | 13,483
Retail | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 413 | 477
Past Due | 25 | 36
Total | 465 | 542
Retail | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 98 | 116
Past Due | 11 | 12
Total | 124 | 149
Retail | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 11,267 | 11,596
Past Due | 273 | 335
Total | 12,517 | 13,204
Retail | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 8,274 | 7,898
Past Due | 44 | 76
Total | 8,450 | 8,134
Retail | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,795 | 1,747
Past Due | 36 | 38
Total | 1,877 | 1,848
Retail | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 2,936 | 2,679
Past Due | 46 | 42
Total | 3,047 | 2,789
Retail | Financing Receivables, 1 to 29 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,800 | 2,301
Retail | Financing Receivables, 1 to 29 Days Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 104 | 147
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 73 | 102
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 361 | 438
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 27 | 29
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 15 | 21
Retail | Financing Receivables, 1 to 29 Days Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 977 | 1,273
Retail | Financing Receivables, 1 to 29 Days Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 132 | 160
Retail | Financing Receivables, 1 to 29 Days Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 46 | 63
Retail | Financing Receivables, 1 to 29 Days Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 65 | 68
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 325 | 433
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 30 | 46
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 8 | 20
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 51 | 78
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7 | 10
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3 | 4
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 174 | 220
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 21 | 23
Retail | Financing Receivables, 30 to 59 Days Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 11 | 12
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 20 | 20
Retail | Financing Receivables 60 To 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 111 | 138
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 9 | 18
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 3 | 4
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 16 | 23
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2 | 4
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1 | 1
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 47 | 55
Retail | Financing Receivables 60 To 89 Days Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 11 | 12
Retail | Financing Receivables 60 To 89 Days Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 8 | 9
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 14 | 12
Retail | Financing Receivables 90 Days or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 463 | 519
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 114 | 120
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 44 | 54
Retail | Financing Receivables 90 Days or More Past Due | Home equity lines of credit |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 189 | 188
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 16 | 22
Retail | Financing Receivables 90 Days or More Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 7 | 7
Retail | Financing Receivables 90 Days or More Past Due | Automobile |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 52 | 60
Retail | Financing Receivables 90 Days or More Past Due | Education |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 12 | 41
Retail | Financing Receivables 90 Days or More Past Due | Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 17 | 17
Retail | Financing Receivables 90 Days or More Past Due | Other retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 12 | $ 10

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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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