Parent Company Condensed Financial Information (Condensed Statement of Cash Flows) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net Cash Provided by Operating Activities		$ 6,247	$ 4,042	$ 3,739
Investing activities
Proceeds from sales of finance receivables and loans initially held-for-investment		55	376	506
Originations and repayments of finance receivables and loans held-for-investment and other, net		(7,927)	2,896	15,353
Purchases of equity securities		(539)	(1,346)	(1,219)
Proceeds from sales of equity securities		846	1,508	1,087
Disposals of operating lease assets		3,023	3,438	2,681
Net change in nonmarketable equity investments		27	56	417
Other, net		(531)	(443)	(450)
Net cash (used in) provided by investing activities		(17,263)	(11,098)	8,427
Financing activities
Net change in short-term borrowings		2,399	(2,136)	(3,395)
Proceeds from issuance of long-term debt		7,125	2,997	3,660
Repayments of long-term debt		(6,464)	(6,068)	(16,107)
Repurchases of common stock		(1,650)	(1,994)	(106)
Preferred stock issuance		0	2,324	0
Trust preferred securities redemption		0	(2,710)	0
Common stock dividends paid		(384)	(324)	(289)
Preferred stock dividends paid		(110)	(57)	0
Net cash provided by (used in) financing activities		11,575	(3,848)	25
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Net (decrease) increase in cash and cash equivalents and restricted cash		552	(10,904)	12,194
Cash and cash equivalents and restricted cash [Roll Forward]
Cash and cash equivalents and restricted cash at beginning of year		5,670	16,574	4,380
Cash and cash equivalents and restricted cash at December 31,		6,222	5,670	16,574
Restricted Cash [Abstract]
Cash and cash equivalents		5,571	5,062
Restricted cash	[1]	651	608
Parent company
Operating activities
Net Cash Provided by Operating Activities		1,733	3,753	848
Investing activities
Proceeds from sales of finance receivables and loans initially held-for-investment		64	378	1,187
Originations and repayments of finance receivables and loans held-for-investment and other, net		(7)	189	601
Net change in loans — intercompany		(65)	(10)	(36)
Purchases of equity securities		0	(8)	0
Proceeds from sales of equity securities		1	0	0
Disposals of operating lease assets		0	0	1
Capital contributions to subsidiaries		0	0	(8)
Returns of contributed capital		52	24	23
Net change in nonmarketable equity investments		8	29	(7)
Other, net		(27)	44	(15)
Net cash (used in) provided by investing activities		26	646	1,746
Financing activities
Net change in short-term borrowings		0	(2,136)	(445)
Proceeds from issuance of long-term debt		1,655	765	2,885
Repayments of long-term debt		(1,088)	(777)	(2,444)
Net change in debt — intercompany		(496)	(336)	169
Repurchases of common stock		(1,650)	(1,994)	(106)
Preferred stock issuance		0	2,324	0
Trust preferred securities redemption		0	(2,710)	0
Common stock dividends paid		(384)	(324)	(290)
Preferred stock dividends paid		(110)	(57)	0
Net cash provided by (used in) financing activities		(2,073)	(5,245)	(231)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Net (decrease) increase in cash and cash equivalents and restricted cash		(314)	(846)	2,363
Cash and cash equivalents and restricted cash [Roll Forward]
Cash and cash equivalents and restricted cash at beginning of year		3,680	4,526	2,163
Cash and cash equivalents and restricted cash at December 31,		3,366	3,680	$ 4,526
Restricted Cash [Abstract]
Cash and cash equivalents		3,333	3,647
Restricted cash		$ 33	$ 33

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