Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current [Abstract]
Federal	$ 53	$ 396	$ 72
Non-United States	98	168	153
State and local	154	169	(81)
Total current	305	733	144
Deferred [Abstract]
Federal	372	(12)	283
Non-United States	61	104	(125)
State and local	(54)	(55)	101
Total deferred	379	37	259
Provision for income taxes	$ 684	$ 770	$ 403
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
United States statutory tax rate	21.00%	21.00%	21.00%
Non-U.S. tax rates under U.S. rate	1.10%	1.30%	1.70%
State and local income taxes	3.00%	2.70%	0.60%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent	0.00%	(8.90%)
Effective Income Tax Rate Reconciliation Foreign Operations Taxed in United States	0.70%	(0.10%)	0.40%
Other	0.40%	0.80%	0.50%
Effective tax rate	26.20%	25.70%	15.30%
Undistributed Foreign Earnings, Deferred Taxes Not Provided	$ 3,900
Deferred tax assets [Abstract]
Net operating loss carryforwards	281	$ 378
Provision for credit losses	318	141
Other foreign	217	190
Employee benefit plans	25	24
Foreign tax credits	682	669
Other	57	46
Total gross deferred tax assets	1,580	1,448
Less: valuation allowance	(65)	(43)
Total net deferred tax assets	1,515	1,405
Deferred tax liabilities [Abstract]
Leasing transactions	3,265	2,674
Finance receivables	574	584
Other foreign	418	568
Other	0	1
Total deferred tax liabilities	4,257	3,827
Net deferred tax liability	2,742	2,422
Amount of valuation allowance released	65
Operating Loss Carryforwards	851
Net operating loss carryforwards	281	378
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at January 1	109	115
Increase - tax positions in prior years	5	40
Increases - tax positions in current year	2	0
Decrease - tax positions in prior years	(8)	(8)
Settlements	0	(36)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0	0
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation	1
Balance at December 31	109	109	$ 115
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	105	106
Unrecognized Tax Benefits Interest Income	3
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	6	8
Income Taxes Paid	1,454	524	188
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation		2
Unrecognized Tax Benefits Interest Expense		3	7
Income Tax Contingency [Line Items]
Income before income taxes	2,608	2,998	2,627
Non U.S. [member]
Income Tax Contingency [Line Items]
Income before income taxes	523	838	910
United States [member]
Income Tax Contingency [Line Items]
Income before income taxes	$ 2,085	$ 2,160	$ 1,717