Consolidated Statement of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net income		$ 1,020	$ 1,714	$ 3,060
Reconciliation of net income to net cash provided by operating activities
Depreciation and amortization		1,247	1,327	1,261
Goodwill impairment		149	0	0
Provision for credit losses		1,968	1,399	241
Gain on mortgage and automotive loans, net		(16)	(52)	(87)
Other (gain) loss on investments, net		(144)	120	(285)
Loss on extinguishment of debt		0	0	136
Originations and purchases of loans held-for-sale		(2,406)	(3,907)	(4,255)
Proceeds from sales and repayments of loans held-for-sale		2,811	3,774	4,107
Net change in
Deferred income taxes		(58)	553	120
Interest payable		450	198	(204)
Other assets		(417)	957	(302)
Other liabilities		(91)	(103)	356
Other, net		150	267	(106)
Net cash provided by operating activities		4,663	6,247	4,042
Investing activities
Purchases of equity securities		(339)	(539)	(1,346)
Proceeds from sales of equity securities		356	846	1,508
Purchases of available-for-sale securities		(518)	(6,723)	(21,557)
Proceeds from sales of available-for-sale securities		337	820	5,745
Proceeds from repayments of available-for-sale securities		2,057	4,276	10,724
Purchases of held-to-maturity securities		0	(47)	(292)
Proceeds from repayments of held-to-maturity securities		123	154	372
Purchases of finance receivables and loans held-for-investment		(4,233)	(7,165)	(6,756)
Proceeds from sales of finance receivables and loans initially held-for-investment		258	55	376
Originations and repayments of finance receivables and loans held-for-investment and other, net		(5,040)	(7,927)	2,896
Purchases of operating lease assets		(2,759)	(3,532)	(5,120)
Disposals of operating lease assets		3,122	3,023	3,438
Acquisitions, net of cash acquired		0	0	(699)
Net change in nonmarketable equity investments		(73)	27	56
Other, net		(579)	(531)	(443)
Net cash used in investing activities		(7,288)	(17,263)	(11,098)
Financing activities
Net change in short-term borrowings		898	2,399	(2,136)
Net increase in deposits		2,342	10,703	4,511
Proceeds from issuance of long-term debt		5,705	7,125	2,997
Repayments of long-term debt		(4,595)	(6,464)	(6,068)
Purchases of land and buildings in satisfaction of finance lease liabilities		0	(44)	(391)
Repurchases of common stock		(33)	(1,650)	(1,994)
Preferred stock issuance		0	0	2,324
Trust preferred securities redemption		0	0	(2,710)
Common stock dividends paid		(368)	(384)	(324)
Preferred stock dividends paid		(110)	(110)	(57)
Net cash provided by (used in) financing activities		3,839	11,575	(3,848)
Effect of exchange-rate changes on cash and cash equivalents and restricted cash		3	(7)	0
Net increase (decrease) in cash and cash equivalents and restricted cash		1,217	552	(10,904)
Cash and cash equivalents and restricted cash at beginning of year		6,222	5,670	16,574
Cash and cash equivalents and restricted cash at December 31,		7,439	6,222	5,670
Cash paid (received) for
Interest		6,357	2,583	2,033
Income taxes		(27)	(425)	1,292
Noncash items
Held-to-maturity securities received in consideration for loans sold		82	0	0
Available-for-sale securities transferred to held-to-maturity securities		3,644	0	0
Loans held-for-sale transferred to finance receivables and loans held-for-investment		208	120	136
Additions of property and equipment		0	0	46
Deconsolidation of debt related to loans sold		1,373	0	0
Finance receivables and loans held-for-investment transferred to loans held-for-sale	[1]	3,739	23	414
Transfer of equity-method investments to equity securities		0	40	0
Transfer of nonmarketable equity investments to equity securities		19	1	0
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents on the Consolidated Balance Sheet		6,945	5,571
Restricted cash included in other assets on the Consolidated Balance Sheet	[2]	494	651
Total cash and cash equivalents and restricted cash in the Consolidated Statement of Cash Flows		$ 7,439	$ 6,222	$ 5,670

[1] Includes personal lending finance receivables and loans, net that were transferred to loans held-for-sale, and are included in assets of operations held-for-sale on our Consolidated Balance Sheet at December 31, 2023. Refer to Note 2 for additional information.

[2] Restricted cash balances relate primarily to our securitization arrangements. Refer to Note 13 for additional details describing the nature of restricted cash balances.