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MORTGAGE BANKING AND OTHER - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 123,090		$ 119,088
Retained earnings	6,445		6,498
Mortgage loans serviced for others | Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retained earnings		$ 6
Banking Subsidiaries | Mortgage loans serviced for others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 81,200		$ 77,500

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