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MORTGAGE BANKING AND OTHER - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
MSR portfolio fair value	$ 978	$ 658
Weighted average life (in years)	6 years	4 years 2 months 12 days
Weighted average constant prepayment rate	11.30%	17.30%
Weighted average option adjusted spread	5.82%	5.95%
Minimum
Servicing Assets at Fair Value [Line Items]
Sensitivity analysis, basis spread	0.50%	0.50%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Decline in fair value due to 50 bps decrease in prepayment rate	$ 125	$ 122
Decline in fair value due to 50 bps decrease in option adjusted spread	$ 20	$ 12
Maximum
Servicing Assets at Fair Value [Line Items]
Sensitivity analysis, basis spread	1.00%	1.00%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Decline in fair value due to 100 bps decrease in prepayment rate	$ 275	$ 202
Decline in fair value due to 100 bps decrease in option adjusted spread	$ 39	$ 24

X

- Definition

Sensitivity Analysis Of Fair Value, Fair Value Method, Transferor's Interests In Transferred Financial Assets, Impact Of 1 Percent Adverse Change In Option Adjusted Spread

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Sensitivity Analysis Of Fair Value, Fair Value Method, Transferor's Interests In Transferred Financial Assets, Impact of 0.5 Percent Adverse Change In Prepayment Speed

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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-Publisher FASB
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Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

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Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

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Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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