Condensed Consolidated Statement of Cash Flows (unaudited) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Operating activities
Net (loss) income		$ (225)	$ 143
Reconciliation of net (loss) income to net cash provided by operating activities
Depreciation and amortization		361	310
Goodwill impairment		305	0	$ 118
Provision for credit losses		191	507
Gain on mortgage and automotive loans, net		(1)	(6)
Other loss (gain) on investments, net		499	(29)
Originations and purchases of loans held-for-sale		(490)	(698)
Proceeds from sales and repayments of loans held-for-sale		543	645
Net change in
Deferred income taxes		(178)	(50)
Interest payable		64	260
Other assets		(128)	142
Other liabilities		(137)	(38)
Other, net		136	80
Net cash provided by operating activities		940	1,266
Investing activities
Purchases of equity securities		(196)	(186)
Proceeds from sales of equity securities		122	259
Purchases of available-for-sale securities		(3,649)	(148)
Proceeds from sales of available-for-sale securities		2,669	46
Proceeds from repayments of available-for-sale securities		440	392
Purchases of held-to-maturity securities		(248)	0
Proceeds from repayments of held-to-maturity securities		109	100
Purchases of finance receivables and loans held-for-investment		(843)	(1,056)
Proceeds from sales of finance receivables and loans initially held-for-investment		5	1,060
Originations and repayments of finance receivables and loans initially held-for-investment and other, net		537	899
Purchases of operating lease assets		(819)	(709)
Disposals of operating lease assets		681	964
Proceeds from sale of a business unit or operation, net		0	1,949
Net change in nonmarketable equity investments		2	141
Other, net		(151)	(135)
Net cash (used in) provided by investing activities		(1,341)	3,576
Financing activities
Net change in short-term borrowings		1,714	(3,297)
Net (decrease) increase in deposits		(64)	389
Proceeds from issuance of long-term debt		24	123
Repayments of long-term debt		(1,074)	(699)
Repurchases of common stock		(34)	(29)
Common stock dividends paid		(100)	(97)
Preferred stock dividends paid		(28)	(28)
Net cash provided by (used in) financing activities		438	(3,638)
Effect of exchange-rate changes on cash and cash equivalents and restricted cash		0	(3)
Net increase in cash and cash equivalents and restricted cash		37	1,201
Cash and cash equivalents and restricted cash at beginning of year		11,380	7,439	7,439
Cash and cash equivalents and restricted cash at March 31,		11,417	8,640	11,380
Cash paid for
Interest		1,587	1,641
Income taxes		13	7
Noncash items
Held-to-maturity securities received in consideration for loans sold		0	56
Loans held-for-sale transferred to finance receivables and loans held-for-investment		0	1
Finance receivables and loans held-for-investment transferred to loans held-for-sale		2,321	1,153
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents on the Condensed Consolidated Balance Sheet		10,409	8,153	10,292
Restricted cash and cash equivalents and restricted cash held for securitization trusts included in other assets on the Condensed Consolidated Balance Sheet	[1]	1,008	487
Total cash and cash equivalents and restricted cash in the Condensed Consolidated Statement of Cash Flows		$ 11,417	$ 8,640	$ 11,380

[1] Refer to Note 11 for additional details describing the nature of restricted cash and cash equivalent balances.