LOANS AND LEASES - Summary of Loans and Leases Portfolio (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases commercial		$ 45,068	$ 43,226
Loans and leases retail		51,470	50,184
Loans and leases		96,538	93,410
Loans held for sale		397	256
Banking Subsidiaries
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans serviced for others by the Company's subsidiaries		17,800	17,900
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases commercial		33,027	31,431
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases commercial		8,157	7,809
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases commercial		3,884	3,986
Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases retail		12,253	11,832
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases retail		3,022	3,424
Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases retail		14,917	15,423
Home equity loans serviced by others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases retail	[1]	1,126	1,228
Home equity lines of credit serviced by others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases retail	[1]	494	550
Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases retail		13,727	12,706
Student
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases retail		3,355	2,256
Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases retail		1,613	1,693
Other retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases retail		963	1,072
Total Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	[2],[3]	96,538	93,410
Residential mortgage and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 697	$ 281

[1] The Company’s SBO portfolio consists of purchased home equity loans and lines that were originally serviced by others. The Company now services a portion of this portfolio internally.

[2] Excluded from the table above are loans held for sale totaling $697 million as of June 30, 2015 and $281 million as of December 31, 2014.

[3] Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $17.8 billion and $17.9 billion at June 30, 2015 and December 31, 2014, respectively.