Consolidated Statement of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities
Net income		$ 668	$ 957	$ 1,714
Reconciliation of net income to net cash provided by operating activities
Depreciation and amortization		1,199	1,227	1,327
Goodwill impairment		118	149	0
Provision for credit losses		2,166	1,968	1,399
Gain on mortgage and automotive loans, net		(24)	(16)	(52)
Other (gain) loss on investments, net		(72)	(144)	120
Originations and purchases of loans held-for-sale		(2,223)	(2,406)	(3,907)
Proceeds from sales and repayments of loans held-for-sale		2,636	2,811	3,774
Net change in
Deferred income taxes		(436)	(81)	553
Interest payable		32	450	198
Other assets		73	(417)	957
Other liabilities		127	(91)	(103)
Other, net		264	150	267
Net cash provided by operating activities		4,528	4,557	6,247
Investing activities
Purchases of equity securities		(884)	(339)	(539)
Proceeds from sales of equity securities		915	356	846
Purchases of available-for-sale securities		(717)	(518)	(6,723)
Proceeds from sales of available-for-sale securities		168	337	820
Proceeds from repayments of available-for-sale securities		2,143	2,057	4,276
Purchases of held-to-maturity securities		0	0	(47)
Proceeds from repayments of held-to-maturity securities		476	123	154
Purchases of finance receivables and loans held-for-investment		(3,572)	(4,233)	(7,165)
Proceeds from sales of finance receivables and loans initially held-for-investment		1,400	258	55
Originations and repayments of finance receivables and loans held-for-investment and other, net		3,282	(5,040)	(7,927)
Purchases of operating lease assets		(3,460)	(2,759)	(3,532)
Disposals of operating lease assets		3,808	3,228	3,023
Proceeds from sale of a business unit, net		1,956	0	0
Net change in nonmarketable equity investments		84	(73)	27
Other, net		(608)	(579)	(531)
Net cash provided by (used in) investing activities		4,991	(7,182)	(17,263)
Financing activities
Net change in short-term borrowings		(1,672)	898	2,399
Net (decrease) increase in deposits		(3,227)	2,342	10,703
Proceeds from issuance of long-term debt		4,337	5,705	7,125
Repayments of long-term debt		(4,484)	(4,595)	(6,464)
Purchases of land and buildings in satisfaction of finance lease liabilities		0	0	(44)
Repurchases of common stock		(38)	(33)	(1,650)
Common stock dividends paid		(372)	(368)	(384)
Preferred stock dividends paid		(110)	(110)	(110)
Net cash (used in) provided by financing activities		(5,566)	3,839	11,575
Effect of exchange-rate changes on cash and cash equivalents and restricted cash		(12)	3	(7)
Net increase in cash and cash equivalents and restricted cash		3,941	1,217	552
Cash and cash equivalents and restricted cash at beginning of year		7,439	6,222	5,670
Cash and cash equivalents and restricted cash at December 31,		11,380	7,439	6,222
Cash paid (received) for
Interest		7,354	6,357	2,583
Income taxes		135	(27)	(425)
Noncash items
Held-to-maturity securities received in consideration for loans sold		56	82	0
Available-for-sale securities transferred to held-to-maturity securities		0	3,644	0
Loans held-for-sale transferred to finance receivables and loans held-for-investment		34	208	120
Deconsolidation of debt related to loans sold		0	1,373	0
Finance receivables and loans held-for-investment transferred to loans held-for-sale		1,731	3,739	23
Transfer of equity-method investments to equity securities		0	0	40
Transfer of nonmarketable equity investments to equity securities		0	19	1
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents on the Consolidated Balance Sheet		10,292	6,945
Restricted cash and cash equivalents and restricted cash held for securitization trusts included in other assets on the Consolidated Balance Sheet	[1]	1,088	494
Total cash and cash equivalents and restricted cash in the Consolidated Statement of Cash Flows		$ 11,380	$ 7,439	$ 6,222

[1] Refer to Note 13 for additional details describing the nature of restricted cash and cash equivalent balances.