Income Taxes	6 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 13 – Income Taxes Our effective tax rate was 37 percent for the three and six months ended September 30, 2017 and 2016. Our provision for income taxes was $70 million and $166 million for the three and six months ended September 30, 2017, compared to $95 million and $241 million for the same periods in fiscal 2017. The decrease in the provision for income taxes for the three and six months ended September 30, 2017 is consistent with the decrease in our income before tax compared to the same periods in fiscal 2017. Tax-related Contingencies As of September 30, 2017, we remain under IRS examination for fiscal 2017 and fiscal 2018. The IRS examination for fiscal 2016 was concluded in the first quarter of fiscal 2018. We periodically review our uncertain tax positions. Our assessment is based on many factors including any ongoing IRS audits. For the quarter ended September 30, 2017, our assessment did not result in a material change in unrecognized tax benefits. Our deferred tax assets were $3.0 billion and $1.0 billion at September 30, 2017 and March 31, 2017, and were primarily due to the deferred deduction of allowance for credit and residual value losses and federal tax loss carryforward that expires in fiscal 2038. The total deferred tax liability, net of these deferred tax assets, was $8.1 billion and $7.9 billion at September 30, 2017 and March 31, 2017, respectively. Realization with respect to the federal tax loss carryforward is dependent on generating sufficient income prior to expiration of the loss carryforward. Although realization is not assured, management believes it is more likely than not that the deferred tax assets will be realized. The amount of the deferred tax assets considered realizable could be reduced if management’s estimates change.

Note 13 – Income Taxes

Our effective tax rate was 37 percent for the three and six months ended September 30, 2017 and 2016. Our provision for income taxes was $70 million and $166 million for the three and six months ended September 30, 2017, compared to $95 million and $241 million for the same periods in fiscal 2017. The decrease in the provision for income taxes for the three and six months ended September 30, 2017 is consistent with the decrease in our income before tax compared to the same periods in fiscal 2017.

Tax-related Contingencies

As of September 30, 2017, we remain under IRS examination for fiscal 2017 and fiscal 2018. The IRS examination for fiscal 2016 was concluded in the first quarter of fiscal 2018.

We periodically review our uncertain tax positions. Our assessment is based on many factors including any ongoing IRS audits. For the quarter ended September 30, 2017, our assessment did not result in a material change in unrecognized tax benefits.

Our deferred tax assets were $3.0 billion and $1.0 billion at September 30, 2017 and March 31, 2017, and were primarily due to the deferred deduction of allowance for credit and residual value losses and federal tax loss carryforward that expires in fiscal 2038. The total deferred tax liability, net of these deferred tax assets, was $8.1 billion and $7.9 billion at September 30, 2017 and March 31, 2017, respectively. Realization with respect to the federal tax loss carryforward is dependent on generating sufficient income prior to expiration of the loss carryforward. Although realization is not assured, management believes it is more likely than not that the deferred tax assets will be realized. The amount of the deferred tax assets considered realizable could be reduced if management’s estimates change.