FINANCE RECEIVABLES AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Credit Quality (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Allowance for Credit Losses [Line Items]
Financing Receivables	$ 121,610		$ 121,610		$ 122,814
Total	176	$ 155	503	$ 415
Consumer
Allowance for Credit Losses [Line Items]
Financing receivable, originated, more than five years before current fiscal year	1,719		1,719		846
Financing receivable, year five, originated, four years before current fiscal year	2,973		2,973		3,282
Financing receivable, originated three years before latest fiscal year	7,828		7,828		5,604
Financing receivable, originated two years before latest fiscal year	17,707		17,707		12,542
Financing receivable, originated in fiscal year before latest fiscal year	29,726		29,726		24,513
Financing receivable, originated in current fiscal year	24,005		24,005		36,545
Financing Receivables	$ 83,958		$ 83,958		$ 83,332
Percent	100.00%		100.00%		100.00%
Financing receivable, originated, more than five years before current fiscal year, writeoff			$ 44		$ 46
Financing receivable, year five, originated, four years before current fiscal year, writeoff			43		58
Financing receivable, year four, originated, three years before current fiscal year, writeoff			96		71
Financing receivable, year three, originated, two years before current fiscal year, writeoff			142		152
Financing receivable, year two, originated, fiscal year before current fiscal year, writeoff			148		191
Financing receivable, year one, originated, current fiscal year, writeoff			17		50
Total	$ 177	$ 155	490	$ 408	568
Consumer | Total past due
Allowance for Credit Losses [Line Items]
Financing receivable, originated, more than five years before current fiscal year	90		90		58
Financing receivable, year five, originated, four years before current fiscal year	92		92		120
Financing receivable, originated three years before latest fiscal year	184		184		139
Financing receivable, originated two years before latest fiscal year	268		268		244
Financing receivable, originated in fiscal year before latest fiscal year	314		314		324
Financing receivable, originated in current fiscal year	136		136		262
Financing Receivables	$ 1,084		$ 1,084		$ 1,147
Percent	1.30%		1.30%		1.40%
Consumer | 31-60 days past due
Allowance for Credit Losses [Line Items]
Financing receivable, originated, more than five years before current fiscal year	$ 67		$ 67		$ 43
Financing receivable, year five, originated, four years before current fiscal year	67		67		93
Financing receivable, originated three years before latest fiscal year	136		136		104
Financing receivable, originated two years before latest fiscal year	201		201		187
Financing receivable, originated in fiscal year before latest fiscal year	237		237		242
Financing receivable, originated in current fiscal year	95		95		203
Financing Receivables	$ 803		$ 803		$ 872
Percent	1.00%		1.00%		1.00%
Consumer | Greater than 60 days past due
Allowance for Credit Losses [Line Items]
Financing receivable, originated, more than five years before current fiscal year	$ 23		$ 23		$ 15
Financing receivable, year five, originated, four years before current fiscal year	25		25		27
Financing receivable, originated three years before latest fiscal year	48		48		35
Financing receivable, originated two years before latest fiscal year	67		67		57
Financing receivable, originated in fiscal year before latest fiscal year	77		77		82
Financing receivable, originated in current fiscal year	41		41		59
Financing Receivables	$ 281		$ 281		$ 275
Percent	0.30%		0.30%		0.40%
Consumer | Current
Allowance for Credit Losses [Line Items]
Financing receivable, originated, more than five years before current fiscal year	$ 1,629		$ 1,629		$ 788
Financing receivable, year five, originated, four years before current fiscal year	2,881		2,881		3,162
Financing receivable, originated three years before latest fiscal year	7,644		7,644		5,465
Financing receivable, originated two years before latest fiscal year	17,439		17,439		12,298
Financing receivable, originated in fiscal year before latest fiscal year	29,412		29,412		24,189
Financing receivable, originated in current fiscal year	23,869		23,869		36,283
Financing Receivables	$ 82,874		$ 82,874		$ 82,185
Percent	98.70%		98.70%		98.60%