Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current [Abstract]
Federal	$ 72	$ (6)	$ (41)
Non-U.S.	153	241	222
State and local	(81)	(9)	(15)
Total current	144	226	166
Deferred [Abstract]
Federal	283	(1,016)	284
Non-U.S.	(125)	30	1
State and local	101	63	55
Total deferred	259	(923)	340
Provision for income taxes	$ 403	$ (697)	$ 506
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
U.S. statutory tax rate	21.00%	35.00%	35.00%
Non-U.S. tax rates under U.S. rate	1.70%	(4.00%)	(3.80%)
State and local income taxes	0.60%	1.50%	1.30%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Restructuring Charges, Percent		0.00%	0.00%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent	(8.90%)
Effective Income Tax Rate Reconciliation Foreign Operations Taxed in United States	0.40%	15.60%	(4.90%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	(78.10%)	0.00%
Other	0.50%	(0.20%)	(0.70%)
Effective tax rate	15.30%	(30.20%)	26.90%
Future Effective Federal Income Tax Rate, Percent		21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 1,800
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	375
Undistributed Foreign Earnings, Deferred Taxes Not Provided	3,100
Deferred tax assets [Abstract]
Net operating loss carryforwards	339	$ 1,310
Provision for credit losses	175	204
Other foreign	106	79
Employee benefit plans	28	33
Foreign tax credits	1,297	1,244
Other	50	51
Total gross deferred tax assets	1,995	2,921
Less: valuation allowance	(81)	(68)
Total net deferred tax assets	1,914	2,853
Deferred tax liabilities [Abstract]
Leasing transactions	3,126	4,017
Finance receivables	639	523
Other foreign	524	391
Other	4	61
Total deferred tax liabilities	4,293	4,992
Net deferred tax liability	2,379	2,139
Amount of valuation allowance released	81
Operating Loss Carryforwards	1,100
Net operating loss carryforwards	339	1,310
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at January 1	90	80
Increase - tax positions in prior years	28	18
Increases - tax positions in current year	7	1
Decrease - tax positions in prior years	(6)	(2)
Settlements	(1)	(7)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0	(7)
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation		7
Balance at December 31	115	90	$ 80
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	111	85
Unrecognized Tax Benefits Interest Income	7	5	8
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	7	5
Income Taxes Paid	188	$ 220	$ 107
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation	(3)
Potential Deferred Tax Liability Undistributed Foreign Earnings	$ 110