DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
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Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
Dec. 31, 2018 |
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||
| Document Period End Date | Sep. 30, 2019 | ||||
| Fair value hedging adjustments | $ 104 | $ 127 | |||
| Fair Value Hedge Liabilities | $ 7,835 | 7,835 | 4,845 | ||
| Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | 150 | 150 | $ (12) | ||
| Interest expense subordinated notes and other long term debt [Member] | Subordinated notes [Member] | |||||
| Derivative Instruments, Gain (Loss) [Line Items] | |||||
| Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 36 | $ (11) | 165 | $ 55 | |
| Interest expense subordinated notes and other long term debt [Member] | Hedged Subordinated notes [Member] | |||||
| Derivative Instruments, Gain (Loss) [Line Items] | |||||
| Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | $ (32) | $ 12 | $ (162) | $ (49) | |
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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. No definition available.
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- Definition Fair value hedging adjustments No definition available.
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- 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.
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- Definition Fair value of all derivative liabilities designated as fair value hedging instruments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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