Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
Dec. 31, 2016 |
|
| Financing Receivable, Allowance for Credit Losses [Line Items] | |||||
| Provision (benefit) for loan and lease losses | $ 726 | $ 952 | $ 1,566 | $ 1,968 | |
| Loans and leases charged off | 1,350 | 1,378 | 2,660 | 2,874 | |
| Allowance for credit losses | 11,632 | 12,587 | 11,632 | 12,587 | |
| Purchased Credit-impaired | |||||
| Financing Receivable, Allowance for Credit Losses [Line Items] | |||||
| Provision (benefit) for loan and lease losses | (24) | (12) | 44 | (89) | |
| Loans and leases charged off | 55 | 82 | 88 | 187 | |
| Financing receivable allowance sold | 15 | $ 19 | 15 | $ 39 | |
| Allowance for credit losses | $ 375 | $ 375 | $ 419 | ||
| X | ||||||||||
- Definition Amount of reduction of allowance reserve for credit loss arising from sale of loan and lease portfolios. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of expense related to estimated loss from loan and lease transactions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|