FAIR VALUES OF ASSETS AND LIABILITIES - Fair Value Option-Changes in Fair Value (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Fair Value, Measurements, Recurring [Member] | |||
| Fair Value, Option, Quantitative Disclosures [Line Items] | |||
| Net gains (losses) from fair value changes | $ 8 | $ 7 | $ (2) |
| Loans held for investment | |||
| Fair Value, Option, Quantitative Disclosures [Line Items] | |||
| Net gains (losses) from fair value changes | $ 0 | $ 0 | $ (1) |
| X | ||||||||||
- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. 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 | ||||||||||
- Details
|
| X | ||||||||||
- Details
|