Finance Receivables, Net (Summary of Impaired Loans by Class of Finance Receivable) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	$ 206		$ 206		$ 254
Impaired Finance Receivables Individually Evaluated with No Related Allowance	232		232		286
Impaired Finance Receivables Aggregated And Evaluated For Impairment	219		219		226
Impaired Finance Receivables	657		657		766
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	206		206		254
Unpaid Principal Balance Individually Evaluated with No Related Allowance	232		232		286
Unpaid Principal Balance Aggregated And Evaluated For Impairment	216		216		223
Unpaid Principal Balance	654		654		763
Individually Evaluated Allowance	26		26		54
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	200	$ 214	204	$ 205
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	237	235	266	213
Average Impaired Finance Receivables Account Balances Aggregated And Evaluated For Impairment	221	241	223	251
Average Impaired Finance Receivables	658	690	693	669
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	1	1	4	4
Interest Income Recognized Individually Evaluated with No Related Allowance	2	2	7	5
Interest Income Recognized Aggregated And Evaluated For Impairment	4	4	12	13
Interest Income Recognized	7	7	23	22
Wholesale [Member]
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	79		79		98
Impaired Finance Receivables Individually Evaluated with No Related Allowance	126		126		185
Impaired Finance Receivables	205		205		283
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	79		79		98
Unpaid Principal Balance Individually Evaluated with No Related Allowance	126		126		185
Unpaid Principal Balance	205		205		283
Individually Evaluated Allowance	5		5		9
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	78	77	73	83
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	125	136	158	119
Average Impaired Finance Receivables	203	213	231	202
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	0	0	1	1
Interest Income Recognized Individually Evaluated with No Related Allowance	1	1	3	2
Interest Income Recognized	1	1	4	3
Real estate [Member]
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	95		95		119
Impaired Finance Receivables Individually Evaluated with No Related Allowance	106		106		98
Impaired Finance Receivables	201		201		217
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	95		95		119
Unpaid Principal Balance Individually Evaluated with No Related Allowance	106		106		98
Unpaid Principal Balance	201		201		217
Individually Evaluated Allowance	12		12		15
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	89	103	97	87
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	112	94	107	90
Average Impaired Finance Receivables	201	197	204	177
Interest Income Recognized
Interest Income Recognized Individually Evaluated with Related Allowance	1	1	2	2
Interest Income Recognized Individually Evaluated with No Related Allowance	1	1	4	3
Interest Income Recognized	2	2	6	5
Working capital [Member]
Impaired Finance Receivables
Impaired Finance Receivables Individually Evaluated with Related Allowance	32		32		37
Impaired Finance Receivables Individually Evaluated with No Related Allowance	0		0		3
Impaired Finance Receivables	32		32		40
Unpaid Principal Balance
Unpaid Principal Balance Individually Evaluated with Related Allowance	32		32		37
Unpaid Principal Balance Individually Evaluated with No Related Allowance	0		0		3
Unpaid Principal Balance	32		32		40
Individually Evaluated Allowance	9		9		30
Average Impaired Finance Receivables
Average Impaired Finance Receivables Individually Evaluated For Impairment with An Allowance	33	34	34	35
Average Impaired Finance Receivables Individually Evaluated For Impairment Without An Allowance	0	5	1	4
Average Impaired Finance Receivables	33	39	35	39
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	219		219		226
Impaired Finance Receivables	219		219		226
Unpaid Principal Balance
Unpaid Principal Balance Aggregated And Evaluated For Impairment	216		216		223
Unpaid Principal Balance	216		216		$ 223
Average Impaired Finance Receivables
Average Impaired Finance Receivables Account Balances Aggregated And Evaluated For Impairment	221	241	223	251
Average Impaired Finance Receivables	221	241	223	251
Interest Income Recognized
Interest Income Recognized Aggregated And Evaluated For Impairment	4	4	12	13
Interest Income Recognized	$ 4	$ 4	$ 12	$ 13

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