Debt - Credit Facilties and Committed Liquidity Programs (Details)			12 Months Ended
	Dec. 31, 2012 Contractually Committed Liquidity Facilities [Member] USD ($)	Dec. 31, 2012 Unsecured Debt [Member] USD ($)	Dec. 31, 2012 Contractually Committed Liquidity Facilities [Member] USD ($)	Dec. 31, 2012 Retail [Member] Contractually Committed Liquidity Facilities [Member] USD ($)	Dec. 31, 2012 Wholesale [Member] Contractually Committed Liquidity Facilities [Member] USD ($)	Dec. 31, 2012 Operating Lease [Member] Contractually Committed Liquidity Facilities [Member] USD ($)	Dec. 31, 2012 FCE Bank plc [Member] Contractually Committed Liquidity Facilities [Member] USD ($)	Dec. 31, 2012 FCE Bank plc [Member] Syndicated Credit Facility [Member] USD ($)	Dec. 31, 2012 FCE Bank plc [Member] Syndicated Credit Facility [Member] GBP (£)	Dec. 31, 2012 FCE Bank plc [Member] Minimum [Member] USD ($)	Jan. 31, 2013 Subsequent Event [Member] FCE Bank plc [Member] Syndicated Credit Facility [Member] USD ($)	Jan. 31, 2013 Subsequent Event [Member] FCE Bank plc [Member] Syndicated Credit Facility [Member] GBP (£)
Schedule of Debt [Line Items]
Borrowing capacity under credit facilities		$ 922,000,000	$ 6,300,000,000					$ 713,000,000	£ 440,000,000
Credit facility outstanding											535,000,000	330,000,000
Borrowing availability		866,000,000	6,300,000,000
Outstanding commercial paper			5,800,000,000
Debt Covenant Minimum Net Worth Requirement										500,000,000
Line of credit expiration - 2013			3,300,000,000
Line of credit expiration - 2014			3,000,000,000
Minimum Percent Of Outstanding Asset Backed Securities Balance Supported By Debt Facilities			100.00%
Commitment To Sell Commercial Paper Conduits Maximum	24,300,000,000			12,900,000,000	7,000,000,000	4,400,000,000	4,900,000,000
Commitment To Sell Commercial Paper Conduits Current	23,400,000,000						4,200,000,000
Commitment To Sell Commercial Paper Conduits Utilized	$ 12,300,000,000