Income Taxes - Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Liabilities:
Lease transactions	$ 5,642	$ 7,647
State taxes, net of federal tax benefit	856	640
Mark-to-market of investments in marketable securities and derivatives	185	267
Other	244	383
Deferred tax liabilities	6,927	8,937
Assets:
Provision for credit and residual value losses	420	593
Deferred costs and fees	186	306
Net operating loss and tax credit carryforwards	993	67
Other	31	66
Deferred tax assets	1,630	1,032
Valuation allowance	(29)	(21)
Net deferred tax assets	1,601	1,011
Net deferred income tax liability	$ 5,326	$ 7,926

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.