Pension and Other Benefits Plans - Additional Information (Details) (TMS [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Toyota Motor Sales Savings Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Vesting Period	4 years
Annual Minimum Contribution Percentage by Employee	1.00%
Annual Maximum Contribution Percentage by Employee	30.00%
Employer Matching Contribution Percentage	66.67%
Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Employer Matching Contribution, Annual Vesting Percentage	25.00%
Employer contributions to defined contribution plan	$ 7	$ 7	$ 7
Defined Benefit Plan [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Vesting Period	5 years
Maximum employee credited service years	25 years
Highest average compensation consecutive number of months	60 months
Total Number of Last Employment Months	120 months
Pension costs	4	15	8
Other Post-employment Benefits [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Vesting Period	10 years
Employee Minimum Age Eligibility For Post Employment Benefits	55 years
Other post-retirement benefit costs	$ 13	$ 16	$ 15