Finance Receivables Delinquency (Details) (Consumer Finance Receivables, USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013 Rate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	$ 717
Financing Receivable Recorded Investment Greater Than 60 Days Past Due	336
Financing Receivable Recorded Investment Greater Than 30 Days Past Due	1,053
Financing Receivable Recorded Investment Pass Due and in Repossession	38
Financing Receivable, Recorded Investment, Past Due	1,091
Financing Receivable Recorded Investment 31 To 60 Days Past Due Percentage Of Contractual Amount	3.10%
Financing Receivables Greater than 60 Days Past Due Percent of Contractual Amount due	1.40%
Financing Receivable Greater than 30 Days Past Due Percent of Contractual Amount due	4.50%
Financing Receivables Recorded Investment Pass Due and in Repossession Percent of Contractual Amount	0.10%
Percent of Contractual Amount Due	4.60%
North America Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	579	477
Financing Receivable Recorded Investment Greater Than 60 Days Past Due	210	169
Financing Receivable Recorded Investment Greater Than 30 Days Past Due	789	646
Financing Receivable Recorded Investment Pass Due and in Repossession	33	32
Financing Receivable, Recorded Investment, Past Due	822	678
Financing Receivable Recorded Investment 31 To 60 Days Past Due Percentage Of Contractual Amount		4.30%
Financing Receivables Greater than 60 Days Past Due Percent of Contractual Amount due		1.50%
Financing Receivable Greater than 30 Days Past Due Percent of Contractual Amount due		5.80%
Financing Receivables Recorded Investment Pass Due and in Repossession Percent of Contractual Amount		0.30%
Percent of Contractual Amount Due		6.10%
International Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	138
Financing Receivable Recorded Investment Greater Than 60 Days Past Due	126
Financing Receivable Recorded Investment Greater Than 30 Days Past Due	264
Financing Receivable Recorded Investment Pass Due and in Repossession	5
Financing Receivable, Recorded Investment, Past Due	$ 269