Allowance for Credit Losses and Recorded Investment in Finance Receivables by Portfolio Segment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
Allowance for Credit Losses for Finance Receivables:
Allowance for credit losses at	$ 445	$ 467	$ 454	$ 527
Provision for credit losses	103us-gaap_ProvisionForLoanAndLeaseLosses	63us-gaap_ProvisionForLoanAndLeaseLosses	220us-gaap_ProvisionForLoanAndLeaseLosses	102us-gaap_ProvisionForLoanAndLeaseLosses
Allowance for credit losses at	450	456	450	456
Gross Finance Receivables:
Finance receivables	67,200us-gaap_NotesReceivableGross		67,200us-gaap_NotesReceivableGross		65,774us-gaap_NotesReceivableGross
Finance Receivables, Net [Member]
Allowance for Credit Losses for Finance Receivables:
Allowance for credit losses at	381	396	386	445
Charge-offs	(90)	(74)	(219)	(191)
Recoveries	16	14	47	49
Provision for credit losses	70	51	163	84
Allowance for credit losses at	377	387	377	387
Ending Balance: Individually Evaluated for Impairment	28	30	28	30
Ending Balance: Collectively Evaluated for Impairment	349	357	349	357
Gross Finance Receivables:
Finance receivables	67,200	66,731	67,200	66,731	65,774
Ending Balance: Individually Evaluated for Impairment	209	232	209	232
Ending Balance: Collectively Evaluated for Impairment	66,991	66,499	66,991	66,499
Finance Receivables, Net [Member] \| Retail Loan [Member]
Allowance for Credit Losses for Finance Receivables:
Allowance for credit losses at	299	290	296	333
Charge-offs	(89)	(74)	(217)	(190)
Recoveries	14	14	45	49
Provision for credit losses	72	59	172	97
Allowance for credit losses at	296	289	296	289
Ending Balance: Individually Evaluated for Impairment	0	0	0	0
Ending Balance: Collectively Evaluated for Impairment	296	289	296	289
Gross Finance Receivables:
Finance receivables	50,637	49,719	50,637	49,719
Ending Balance: Individually Evaluated for Impairment	0	0	0	0
Ending Balance: Collectively Evaluated for Impairment	50,637	49,719	50,637	49,719
Gross Finance Receivables	277	345	277	345
Finance Receivables, Net [Member] \| Commercial [Member]
Allowance for Credit Losses for Finance Receivables:
Allowance for credit losses at	1	4	2	5
Charge-offs	0	0	(1)	(1)
Recoveries	1	0	1	0
Provision for credit losses	0	(2)	0	(2)
Allowance for credit losses at	2	2	2	2
Ending Balance: Individually Evaluated for Impairment	0	0	0	0
Ending Balance: Collectively Evaluated for Impairment	2	2	2	2
Gross Finance Receivables:
Finance receivables	503	422	503	422
Ending Balance: Individually Evaluated for Impairment	0	0	0	0
Ending Balance: Collectively Evaluated for Impairment	503	422	503	422
Gross Finance Receivables	1	1	1	1
Finance Receivables, Net [Member] \| Dealer Products [Member]
Allowance for Credit Losses for Finance Receivables:
Allowance for credit losses at	81	102	88	107
Charge-offs	(1)	0	(1)	0
Recoveries	1	0	1	0
Provision for credit losses	(2)	(6)	(9)	(11)
Allowance for credit losses at	79	96	79	96
Ending Balance: Individually Evaluated for Impairment	28	30	28	30
Ending Balance: Collectively Evaluated for Impairment	51	66	51	66
Gross Finance Receivables:
Finance receivables	16,060	16,590	16,060	16,590
Ending Balance: Individually Evaluated for Impairment	209	232	209	232
Ending Balance: Collectively Evaluated for Impairment	15,851	16,358	15,851	16,358
Finance Receivables, Net [Member] \| Dealer Products [Member] \| TMS [Member] \| Financial Guarantee [Member]
Gross Finance Receivables:
Ending Balance: Collectively Evaluated for Impairment	913	853	913	853
Finance Receivables, Net [Member] \| Dealer Products [Member] \| Private Toyota Distributors [Member] \| Financial Guarantee [Member]
Gross Finance Receivables:
Ending Balance: Collectively Evaluated for Impairment	131	147	131	147
Investments In Operating Leases, Net [Member]
Allowance for Credit Losses for Finance Receivables:
Allowance for credit losses at					68
Allowance for credit losses at	$ 73		$ 73		$ 68

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Recorded investment of impaired financing receivables aggregated and evaluated for impairment.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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-Publisher FASB

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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Amount of expense related to estimated loss from loan and lease transactions.

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