Borrowings and Credit Arrangements (Details)	3 Months Ended		12 Months Ended				12 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2013 EUR (€)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Covenant Requirement [Member]	Mar. 31, 2013 Actual, Covenant [Member]	Mar. 31, 2013 Credit Facility Two [Member] USD ($)	Mar. 31, 2013 Revolving credit facility [Member] USD ($)	Apr. 18, 2012 Revolving credit facility [Member] USD ($)	Mar. 31, 2013 Uncommitted Credit Facilities With A Commercial Japanese Banks [Member] USD ($)	Mar. 31, 2013 Uncommitted Credit Facilities With A Commercial Japanese Banks [Member] JPY (¥)	Dec. 31, 2012 Uncommitted Credit Facilities With A Commercial Japanese Banks [Member] USD ($)	Mar. 31, 2013 Senior Notes [Member] USD ($)	Mar. 31, 2013 Italy, Spain, Portugal and Greece [Member] USD ($)
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Current Year	$ 0											$ 0
Long-term Debt, Maturities, Repayments of Principal in Year Two	600,000,000											600,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,250,000,000											1,250,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	600,000,000											600,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	250,000,000											250,000,000
Long-term Debt, Maturities, Repayments of Principal After Year Five	1,500,000,000											1,500,000,000
Long-term Debt, Maturities, Total Repayments of Principal	4,200,000,000											4,200,000,000
Summary of compliance with debt covenants
Maximum Leverage Ratio				3.5	2.4
Minimum interest coverage ratio				3.0	6.9
Borrowings and Credit Arrangements (Textuals) [Abstract]
Total debt	4,254,000,000		4,256,000,000
Interest Margin above LIBOR, Minimum								0.875%
Interest Margin above LIBOR, Maximum								1.475%
Line of Credit Facility, Current Interest Rate							1.275%
Commitment fee percentage							0.225%
Restructuring charges remaining to be excluded from calculation of consolidated EBITDA							343,000,000
Legal payments and debt remaining to be excluded from calculation of consolidated EBITDA							2,300,000,000
Senior notes	4,200,000,000		4,200,000,000
Line of Credit Facility, Maximum Borrowing Capacity						350,000,000		2,000,000,000
Maximum amount of proceeds from sale of finance receivables	188,000,000	290,000,000							223,000,000	21,000,000,000
De-recognized receivables			191,000,000						165,000,000		182,000,000
Average interest rate of de-recognized receivables	3.80%	3.80%	1.60%
Average discounted rates of notes receivables									1.80%	1.80%	1.60%
Litigation and Debt Exclusion from EBITDA								2,300,000,000
Exclusion from EBITDA for Restructuring Charges								500,000,000
Letters of Credit Outstanding, Amount	93,000,000		94,000,000
Accounts receivable 180 days past due													55,000,000
Accounts receivable 365 days past due													$ 16,000,000