Debt (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Apr. 01, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Gross long-term debt		$ 4,807,706,000	$ 4,884,133,000
Credit facility initiation date	Apr. 13, 2012
Unaccreted Premium		1,200,000
Long-term Debt, Current Maturities		437,162,000	1,040,247,000
Debt Instrument, Face Amount		675,300,000	1,090,000,000
Repayment of medium term notes		420,870,000	59,211,000	200,000,000
Loss on debt extinguishment		0	0	85,247,000
Debt, Weighted Average Interest Rate		5.25%
Global Credit Facilities [Member]
Debt Instrument [Line Items]
Gross long-term debt			195,600,000
Unsecured Commercial Paper [Member]
Debt Instrument [Line Items]
Weighted-average interest rate of commercial paper		0.75%	1.05%
Debt instrument maturity range, days		365
Medium-Term Notes [Member]
Debt Instrument [Line Items]
Write off of capitalized debt issuance costs		2,200,000	1,900,000
6.8% Medium Term Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		1,000,000,000
RepurchaseOfMediumTermNotes		16,600,000	49,900,000
Debt mature date		Jun. 30, 2018
Debt, Weighted Average Interest Rate		6.80%
5.25% Medium-Term Notes Due In 2012 ($400.0 Million Par Value) [Member]
Debt Instrument [Line Items]
Senior unsecured notes		0	399,916,000
5.25% Medium-Term Notes Due In 2012 ($400.0 Million Par Value) [Member] | Debt Matured [Member]
Debt Instrument [Line Items]
Senior unsecured notes		400,000,000
3.875%MediumTermNotes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		450,000,000
Debt mature date		Mar. 31, 2016
Debt, Weighted Average Interest Rate		3.875%
2.7% Medium Term Notes [Member]
Debt Instrument [Line Items]
Credit facility initiation date		Jan. 31, 2012
Debt Instrument, Face Amount		400,000,000
Debt mature date		Mar. 31, 2017
Debt, Weighted Average Interest Rate		2.70%
1.15% Medium Term Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		600,000,000
Debt mature date		Sep. 30, 2015
Debt, Weighted Average Interest Rate		1.15%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Credit facility initiation date		Feb. 28, 2009
Face amount of senior notes repurchased				297,000,000
Repurchase of senior notes				380,800,000
Loss on debt extinguishment				(85,200,000)
Debt mature date		Feb. 28, 2014
Debt, Weighted Average Interest Rate		15.00%
Senior unsecured notes		600,000,000
Write off of capitalized debt issuance costs				1,000,000
Asset-backed Canadian Commercial Paper Conduit Facility [Member]
Debt Instrument [Line Items]
Credit facility initiation date		Aug. 30, 2012
Maximum Borrowing Capacity Under Conduit Facility		200,000,000
Face Amount of Finance Receivables Transferred		230,000,000
Proceeds from Sale of Finance Receivables		201,300,000
Line of credit facility maturity date		Aug. 30, 2013
Long-term Debt, Current Maturities		37,700,000
New 5 Year Credit Facility Maturing April 2017 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		675,000,000
Line of credit facility maturity date		Apr. 01, 2017
4 Year Credit Facility Maturing April 2015 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		675,000,000
3 Year Credit Facility Maturing April 2013 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		675,000,000
HDFS [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity Under Conduit Facility		600,000,000
Loss on debt extinguishment		(4,300,000)	(9,600,000)
Conduit Facility [Member]
Debt Instrument [Line Items]
Credit facility initiation date		Sep. 14, 2012
Line of credit facility, outstanding borrowings		0	0
SPEs [Member]
Debt Instrument [Line Items]
Secured notes issued through term asset-backed securitization transactions		675,300,000	1,090,000,000
Long-term Debt, Current Maturities		$ 399,500,000	$ 640,300,000