Condensed Consolidated Statement of Cash Flows (unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023
Operating activities
Net income		$ 808	$ 944
Reconciliation of net income to net cash provided by operating activities
Depreciation and amortization		930	923
Provision for credit losses		1,609	1,381
Gain on mortgage and automotive loans, net		(18)	(13)
Other gain on investments, net		(96)	(59)
Originations and purchases of loans held-for-sale		(1,413)	(1,913)
Proceeds from sales and repayments of loans held-for-sale		1,862	2,283
Net change in
Deferred income taxes		(201)	(62)
Interest payable		567	1,029
Other assets		(181)	29
Other liabilities		(130)	52
Other, net		171	86
Net cash provided by operating activities		3,908	4,680
Investing activities
Purchases of equity securities		(630)	(257)
Proceeds from sales of equity securities		680	295
Purchases of available-for-sale securities		(462)	(388)
Proceeds from sales of available-for-sale securities		134	337
Proceeds from repayments of available-for-sale securities		1,450	1,631
Proceeds from repayments of held-to-maturity securities		360	49
Purchases of finance receivables and loans held-for-investment		(2,612)	(3,201)
Proceeds from sales of finance receivables and loans initially held-for-investment		1,190	25
Originations and repayments of finance receivables and loans held-for-investment and other, net		1,526	(2,452)
Purchases of operating lease assets		(2,543)	(2,174)
Disposals of operating lease assets		2,782	2,384
Proceeds from sale of a business unit, net		1,956	0
Net change in nonmarketable equity investments		84	(45)
Other, net		(461)	(419)
Net cash provided by (used in) investing activities		3,454	(4,215)
Financing activities
Net change in short-term borrowings		(1,526)	11
Net (decrease) increase in deposits		(2,757)	525
Proceeds from issuance of long-term debt		2,866	4,893
Repayments of long-term debt		(3,683)	(2,609)
Repurchases of common stock		(31)	(29)
Common stock dividends paid		(280)	(277)
Preferred stock dividends paid		(83)	(83)
Net cash (used in) provided by financing activities		(5,494)	2,431
Effect of exchange-rate changes on cash and cash equivalents and restricted cash		(3)	0
Net increase in cash and cash equivalents and restricted cash		1,865	2,896
Cash and cash equivalents and restricted cash at beginning of year		7,439	6,222
Cash and cash equivalents and restricted cash at September 30,		9,304	9,118
Cash paid (received) for
Interest		5,043	3,895
Income taxes		94	(42)
Noncash items
Held-to-maturity securities received in consideration for loans sold		56	0
Loans held-for-sale transferred to finance receivables and loans held-for-investment		28	208
Finance receivables and loans held-for-investment transferred to loans held-for-sale		1,729	11
Transfer of nonmarketable equity investments to equity securities		0	19
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents on the Condensed Consolidated Balance Sheet		8,616	8,515
Restricted cash and cash equivalents and restricted cash held for securitization trusts included in other assets on the Condensed Consolidated Balance Sheet	[1]	688	603
Total cash and cash equivalents and restricted cash in the Condensed Consolidated Statement of Cash Flows		$ 9,304	$ 9,118

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