Finance Receivables, Net (Summary of Investment in Impaired Loans by Class of Finance Receivable) (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	$ 228		$ 162
Impaired Finance Receivables Individually Evaluated with No Related Allowance	184		198
Impaired Finance Receivables Aggregated And Evaluated For Impairment	260		264
Impaired Finance Receivables	672		624
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	228		162
Unpaid Principal Balance Individually Evaluated with No Related Allowance	184		198
Unpaid Principal Balance Aggregated And Evaluated For Impairment	256		261
Unpaid Principal Balance	668		621
Individually Evaluated Allowance	60		55
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	195	$ 67
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	191	147
Average Impaired Finance Receivables Account Balances Aggregated And Evaluated For Impairment	262	318
Average Impaired Finance Receivables	648	532
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	1	0
Interest Income Recognized Individually Evaluated with No Related Allowance	1	1
Interest Income Recognized Aggregated And Evaluated For Impairment	5	6
Interest Income Recognized	7	7
Wholesale [Member]
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	101		76
Impaired Finance Receivables Individually Evaluated with No Related Allowance	100		105
Impaired Finance Receivables	201		181
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	101		76
Unpaid Principal Balance Individually Evaluated with No Related Allowance	100		105
Unpaid Principal Balance	201		181
Individually Evaluated Allowance	13		14
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	89	17
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	103	50
Average Impaired Finance Receivables	192	67
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	0	0
Interest Income Recognized Individually Evaluated with No Related Allowance	0	0
Interest Income Recognized	0	0
Real estate [Member]
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	90		52
Impaired Finance Receivables Individually Evaluated with No Related Allowance	81		91
Impaired Finance Receivables	171		143
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	90		52
Unpaid Principal Balance Individually Evaluated with No Related Allowance	81		91
Unpaid Principal Balance	171		143
Individually Evaluated Allowance	13		10
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	71	27
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	85	93
Average Impaired Finance Receivables	156	120
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	1	0
Interest Income Recognized Individually Evaluated with No Related Allowance	1	1
Interest Income Recognized	2	1
Working capital [Member]
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	37		34
Impaired Finance Receivables Individually Evaluated with No Related Allowance	3		2
Impaired Finance Receivables	40		36
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	37		34
Unpaid Principal Balance Individually Evaluated with No Related Allowance	3		2
Unpaid Principal Balance	40		36
Individually Evaluated Allowance	34		31
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	35	23
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	3	4
Average Impaired Finance Receivables	38	27
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	0	0
Interest Income Recognized Individually Evaluated with No Related Allowance	0	0
Interest Income Recognized	0	0
Retail Loan [Member]
Impaired Finance Receivables
Impaired Finance Receivables Aggregated And Evaluated For Impairment	260		264
Impaired Finance Receivables	260		264
Unpaid Principal Balance
Unpaid Principal Balance Aggregated And Evaluated For Impairment	256		261
Unpaid Principal Balance	256		261
Average Impaired Finance Receivables
Average Impaired Finance Receivables Account Balances Aggregated And Evaluated For Impairment	262	317
Average Impaired Finance Receivables	262	317
Interest Income Recognized
Interest Income Recognized Aggregated And Evaluated For Impairment	5	6
Interest Income Recognized	5	6
Commercial Finance [Member]
Impaired Finance Receivables
Impaired Finance Receivables Aggregated And Evaluated For Impairment	0		0
Impaired Finance Receivables	0		0
Unpaid Principal Balance
Unpaid Principal Balance Aggregated And Evaluated For Impairment	0		0
Unpaid Principal Balance	0		$ 0
Average Impaired Finance Receivables
Average Impaired Finance Receivables Account Balances Aggregated And Evaluated For Impairment	0	1
Average Impaired Finance Receivables	0	1
Interest Income Recognized
Interest Income Recognized Aggregated And Evaluated For Impairment	0	0
Interest Income Recognized	$ 0	$ 0

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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

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Amount of allowance for credit losses related to recorded investment.

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