Finance Receivables Delinquency (Details) (Consumer Finance Receivables, USD $) In Millions, unless otherwise specified	Sep. 30, 2014 Rate	Sep. 30, 2013 Rate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	$ 979	$ 739
Financing Receivable Recorded Investment Greater Than 60 Days Past Due	425	291
Financing Receivable Recorded Investment Greater Than 30 Days Past Due	1,404	1,030
Financing Receivable Recorded Investment Pass Due and in Repossession	49	45
Financing Receivable, Recorded Investment, Past Due	1,453	1,075
Financing Receivable Recorded Investment 31 To 60 Days Past Due Percentage Of Contractual Amount	3.90%	3.80%
Financing Receivables Greater than 60 Days Past Due Percent of Contractual Amount due	1.70%	1.50%
Financing Receivable Greater than 30 Days Past Due Percent of Contractual Amount due	5.60%	5.30%
Financing Receivables Recorded Investment Pass Due and in Repossession Percent of Contractual Amount	0.20%	0.30%
Percent of Contractual Amount Due	5.80%	5.60%
North America Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	865	690
Financing Receivable Recorded Investment Greater Than 60 Days Past Due	305	247
Financing Receivable Recorded Investment Greater Than 30 Days Past Due	1,170	937
Financing Receivable Recorded Investment Pass Due and in Repossession	44	41
Financing Receivable, Recorded Investment, Past Due	1,214	978
International Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	114	49
Financing Receivable Recorded Investment Greater Than 60 Days Past Due	120	44
Financing Receivable Recorded Investment Greater Than 30 Days Past Due	234	93
Financing Receivable Recorded Investment Pass Due and in Repossession	5	4
Financing Receivable, Recorded Investment, Past Due	$ 239	$ 97