Finance Receivables, Net (Impaired Finance Receivables) (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
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	$ 51		$ 51		$ 63
Impaired Finance Receivables Individually Evaluated with No Related Allowance	158		158		145
Impaired Finance Receivables Aggregated And Evaluated For Impairment	278		278		323
Impaired Finance Receivables	487		487		531
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	51		51		63
Unpaid Principal Balance Individually Evaluated with No Related Allowance	158		158		145
Unpaid Principal Balance Aggregated And Evaluated For Impairment	274		274		319
Unpaid Principal Balance	483		483		527
Individually Evaluated Allowance	28		28		31
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	54	69	60	74
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	154	157	150	159
Average Impaired Finance Receivables Account Balances Aggregated And Evaluated For Impairment	285	356	302	380
Average Impaired Finance Receivables	493tmcc_AverageImpairedFinancingReceivable	582tmcc_AverageImpairedFinancingReceivable	512tmcc_AverageImpairedFinancingReceivable	613tmcc_AverageImpairedFinancingReceivable
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	0	0	1	2
Interest Income Recognized Individually Evaluated with No Related Allowance	1	2	3	4
Interest Income Recognized Aggregated And Evaluated For Impairment	5	7	17	22
Interest Income Recognized	6	9	21	28
Wholesale [Member]
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	15		15		13
Impaired Finance Receivables Individually Evaluated with No Related Allowance	72		72		51
Impaired Finance Receivables	87		87		64
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	15		15		13
Unpaid Principal Balance Individually Evaluated with No Related Allowance	72		72		51
Unpaid Principal Balance	87		87		64
Individually Evaluated Allowance	2		2		1
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	17	15	17	17
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	62	61	56	61
Average Impaired Finance Receivables	79	76	73	78
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	0	0	0	0
Interest Income Recognized Individually Evaluated with No Related Allowance	0	1	1	1
Interest Income Recognized	0	1	1	1
Real estate [Member]
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	14		14		27
Impaired Finance Receivables Individually Evaluated with No Related Allowance	83		83		90
Impaired Finance Receivables	97		97		117
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	14		14		27
Unpaid Principal Balance Individually Evaluated with No Related Allowance	83		83		90
Unpaid Principal Balance	97		97		117
Individually Evaluated Allowance	4		4		8
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	14	31	20	33
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	89	92	91	93
Average Impaired Finance Receivables	103	123	111	126
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	0	0	0	1
Interest Income Recognized Individually Evaluated with No Related Allowance	1	1	2	3
Interest Income Recognized	1	1	2	4
Working capital [Member]
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	22		22		23
Impaired Finance Receivables Individually Evaluated with No Related Allowance	3		3		4
Impaired Finance Receivables	25		25		27
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	22		22		23
Unpaid Principal Balance Individually Evaluated with No Related Allowance	3		3		4
Unpaid Principal Balance	25		25		27
Individually Evaluated Allowance	22		22		22
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	23	23	23	24
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	3	4	3	5
Average Impaired Finance Receivables	26	27	26	29
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	0	0	1	1
Interest Income Recognized Individually Evaluated with No Related Allowance	0	0	0	0
Interest Income Recognized	0	0	1	1
Retail Loan [Member]
Impaired Finance Receivables
Impaired Finance Receivables Aggregated And Evaluated For Impairment	277		277		322
Impaired Finance Receivables	277		277		322
Unpaid Principal Balance
Unpaid Principal Balance Aggregated And Evaluated For Impairment	273		273		318
Unpaid Principal Balance	273		273		318
Average Impaired Finance Receivables
Average Impaired Finance Receivables Account Balances Aggregated And Evaluated For Impairment	284	355	301	379
Average Impaired Finance Receivables	284	355	301	379
Interest Income Recognized
Interest Income Recognized Aggregated And Evaluated For Impairment	5	7	17	22
Interest Income Recognized	5	7	17	22
Commercial Finance [Member]
Impaired Finance Receivables
Impaired Finance Receivables Aggregated And Evaluated For Impairment	1		1		1
Impaired Finance Receivables	1		1		1
Unpaid Principal Balance
Unpaid Principal Balance Aggregated And Evaluated For Impairment	1		1		1
Unpaid Principal Balance	1		1		1
Average Impaired Finance Receivables
Average Impaired Finance Receivables Account Balances Aggregated And Evaluated For Impairment	1	1	1	1
Average Impaired Finance Receivables	1	1	1	1
Interest Income Recognized
Interest Income Recognized Aggregated And Evaluated For Impairment	0	0	0	0
Interest Income Recognized	$ 0	$ 0	$ 0	$ 0

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Average impaired financing receivables individually evaluated for which there is a related allowance for credit losses.

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Interest income, recognized on an accrual basis, on financing receivables, aggregated and evaluated for impairment.

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Interest income, individually evaluated and recognized on accrual basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.

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Recorded investment of impaired financing receivables individually evaluated for which there is no related allowance for credit losses.

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Unpaid principal balance of impaired financing receivables individually evaluated for which there is no related allowance for credit losses.

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Interest income, individually evaluated and recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

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Recorded investment of impaired financing receivables individually evaluated for which there is a related allowance for credit losses.

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Unpaid principal balance of impaired financing receivables individually evaluated for which there is a related allowance for credit losses.

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

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

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Amount of allowance for credit losses related to recorded investment.

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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