DESCRIPTION OF BUSINESS, BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Recently Adopted Accounting Standards) (Details) - USD ($) $ in Thousands	Jun. 30, 2020		Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019		Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing receivable, allowance for credit loss	$ 7,112,739	[1]	$ 6,623,736		$ 3,646,189	[1]	$ 3,783,833	$ 3,843,095	$ 3,897,130
Decrease in stockholders' equity	20,226,777		22,223,973		24,398,830		$ 24,504,820	$ 24,128,405	23,847,232
Deferred tax liabilities, net	$ (101,000)				(1,000,000)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing receivable, allowance for credit loss					2,535,883
Decrease in stockholders' equity			$ (132)		$ (1,785,464)				$ 18,652
ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing receivable, allowance for credit loss				$ 2,500,000
Deferred tax liabilities, net				$ 700,000

[1] The Company has interests in certain Trusts that are considered VIEs for accounting purposes. At June 30, 2020 and December 31, 2019, LHFI included $22.5 billion and $26.5 billion, Operating leases assets, net included $16.2 billion and $16.5 billion, restricted cash included $1.6 billion and $1.6 billion, other assets included $703.2 million and $625.4 million, Borrowings and other debt obligations included $32.3 billion and $34.2 billion, and Other liabilities included $101.1 million and $188.1 million of assets or liabilities that were included within VIEs, respectively. See Note 7 to these Condensed Consolidated Financial Statements for additional information.