Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2021	Jan. 01, 2020	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net	$ 105,070					$ 92,350	$ 105,070
Other assets	3,705					2,524	3,705			$ 3,390
Deferred income taxes	504					676	504			2,535
Other Liabilities	2,280						2,280
Accumulated other comprehensive income	(478)					(690)	(478)
Retained earnings	10,818					7,839	10,818			9,703
Provision for income taxes						210	270	$ 378
Net income	827	$ 1,041	$ 476	$ (6)		4,521	2,338	2,620
Net change in deferred income taxes						147	61	89
Increase (Decrease) in Other Operating Assets							(64)	32
Increase (Decrease) in Other Operating Liabilities							(321)	(207)
All other operating activities						168	94	103
Cash distributions to parent						(7,500)	(3,290)	(2,900)
Total shareholder’s interest	15,567				$ 16,389	12,398	15,567	16,389			$ 16,625
Leasing transactions	451					597	451
Deferred Tax Assets, Gross	588					612	588
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income						4,521	2,338	2,620
Accounting Standards Update 2019-12 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets									$ (888)
Deferred income taxes									(2,403)
Other Liabilities									(26)
Accumulated other comprehensive income									(65)
Retained earnings									1,606
Provision for income taxes							(414)	(392)
Net income					392		414	392
Net change in deferred income taxes							318	(52)
Increase (Decrease) in Other Operating Assets							866	(100)
Increase (Decrease) in Other Operating Liabilities							(93)	(344)
All other operating activities							(6)	0
Cash distributions to parent							875	0
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets	4,593				3,398		4,593	3,398
Deferred income taxes	2,907				2,593		2,907	2,593	3,400
Other Liabilities	2,306						2,306
Accumulated other comprehensive income	(413)						(413)
Retained earnings	9,212				9,905		9,212	9,905
Provision for income taxes							684	770
Net income							1,924	2,228
Net change in deferred income taxes							(379)	(37)
Increase (Decrease) in Other Operating Assets							(930)	132
Increase (Decrease) in Other Operating Liabilities							(228)	137
All other operating activities							(88)	(103)
Cash distributions to parent							2,415	2,900
Leasing transactions									2,800
Deferred Tax Assets, Gross									1,000
Previously Reported | Foreign Tax Authority
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Tax Assets, Gross									700
Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net	252					0	252
Other assets										(8)
Deferred income taxes										(58)
Retained earnings										(202)
Total shareholder’s interest	(242)						(242)
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholder’s interest	(242)						(242)			202
Accounting Standards Update 2019-12 [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholder’s interest									40
Accounting Standards Update 2019-12, 2016-13 | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total shareholder’s interest									$ 242
Retail Installment loans, dealer financing, and other financing [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net	97,043				106,131	85,347	97,043	106,131		105,901
Retail Installment loans, dealer financing, and other financing [Member] | Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net										(230)
Finance Lease [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net	$ 8,027				$ 8,186	$ 7,003	$ 8,027	$ 8,186		8,164
Finance Lease [Member] | Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net										$ (22)