Commitments and Contingent Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Guarantees [Abstract]
Related liability	$ 1,000,000	$ 2,000,000	$ 2,000,000
SPC's assets in Consolidated Statements of Financial Position	1,010,000,000	927,000,000	586,000,000
SPC's liabilities in Consolidated Statements of Financial Position	1,010,000,000	927,000,000	586,000,000
Unused commitments and lines of credit for dealers	10,630,000,000	10,970,000,000	6,600,000,000
Unused commitments and lines of credit for customers	4,640,000,000	4,690,000,000	2,790,000,000
Guarantor Obligations
Guarantees, maximum potential amount of future payments	55,000,000	61,000,000	80,000,000
Guarantees with customers
Guarantor Obligations
Guarantees, maximum potential amount of future payments	55,000,000	61,000,000	69,000,000
Limited indemnity
Guarantor Obligations
Guarantees, maximum potential amount of future payments	$ 0	$ 0	$ 11,000,000