Condensed Consolidated Statement of Comprehensive Income (unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing revenue and other interest income
Interest and fees on finance receivables and loans		$ 1,619	$ 1,602	$ 4,789	$ 4,974
Interest on loans held-for-sale		5	5	14	11
Interest and dividends on investment securities and other earning assets		155	173	433	596
Interest on cash and cash equivalents		5	5	13	23
Operating leases		393	360	1,147	1,070
Total financing revenue and other interest income		2,177	2,145	6,396	6,674
Interest expense
Interest on deposits		245	452	819	1,585
Interest on short-term borrowings		0	9	1	39
Interest on long-term debt		191	309	671	975
Interest on other		8	0	8	0
Total interest expense		444	770	1,499	2,599
Net depreciation expense on operating lease assets		139	175	384	675
Net financing revenue and other interest income		1,594	1,200	4,513	3,400
Other revenue
Insurance premiums and service revenue earned		279	276	837	816
Gain on mortgage and automotive loans, net		18	33	73	35
Loss on extinguishment of debt		(52)	(49)	(126)	(50)
Other gain on investments, net		24	64	212	173
Other income, net of losses		122	160	498	331
Total other revenue		391	484	1,494	1,305
Total net revenue		1,985	1,684	6,007	4,705
Provision for credit losses		76	147	31	1,337
Noninterest expense
Compensation and benefits expense		389	342	1,230	1,036
Insurance losses and loss adjustment expenses		69	85	206	301
Goodwill impairment		0	0	0	50
Other operating expenses		544	478	1,584	1,423
Total noninterest expense		1,002	905	3,020	2,810
Income (loss) from continuing operations before income tax expense		907	632	2,956	558
Income tax expense from continuing operations		195	156	549	159
Net income from continuing operations	[1]	712	476	2,407	399
Income (loss) from discontinued operations, net of tax	[1]	0	0	1	(1)
Net income		712	476	2,408	398
Other comprehensive (loss) income, net of tax		(165)	(120)	(580)	572
Comprehensive income		547	356	1,828	970
Net income from continuing operations attributable to common stockholders	[1]	683	476	2,378	399
Net income attributable to common stockholders	[1]	$ 683	$ 476	$ 2,379	$ 398
Basic weighted-average common shares outstanding	[1],[2]	359,179,000	375,658,000	368,215,000	375,478,000
Diluted weighted-average common shares outstanding	[1],[2],[3]	361,855,000	377,011,000	370,745,000	376,659,000
Basic earnings per common share
Net income (loss) from continuing operations (in dollars per share)	[1]	$ 1.90	$ 1.27	$ 6.46	$ 1.06
Net income (loss) (in dollars per share)	[1]	1.90	1.27	6.46	1.06
Diluted earnings per common share
Net income (loss) from continuing operations (in dollars per share)	[1]	1.89	1.26	6.41	1.06
Net income (loss) (in dollars per share)	[1]	1.89	1.26	6.42	1.06
Cash dividends declared per common share (in dollars per share)	[1]	$ 0.25	$ 0.19	$ 0.63	$ 0.57
Antidilutive securities excluded from computation of earnings per share, amount		0	400,000	0	1,000,000

[1] Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.

[2] Includes shares related to share-based compensation that vested but were not yet issued.

[3] During the three months and nine months ended September 30, 2020, there were 0.4 million and 1.0 million, respectively, in shares underlying share-based awards excluded because their inclusion would have been antidilutive. There were no antidilutive shares during the three months and nine months ended September 30, 2021.