Income Taxes - Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Liabilities:
Lease transactions	$ 7,121	$ 5,642
State taxes, net of federal tax benefit	847	856
Mark-to-market of investments in marketable securities and derivatives	44	185
Other	288	244
Deferred tax liabilities	8,300	6,927
Assets:
Provision for credit and residual value losses	361	420
Deferred costs and fees	192	186
Net operating loss and tax credit carryforwards	2,297	993
Other	22	31
Deferred tax assets	2,872	1,630
Valuation allowance	(24)	(29)
Net deferred tax assets	2,848	1,601
Net deferred income tax liability	$ 5,452	$ 5,326

The sum of the tax effects as of the balance sheet date of the amount of excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset. And the The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

No definition available.