Borrowings and Credit Arrangements (Details) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended							0 Months Ended		0 Months Ended		3 Months Ended					0 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Uncommitted Credit Facilities With A Commercial Japanese Banks [Member] USD ($)	Mar. 31, 2015 Uncommitted Credit Facilities With A Commercial Japanese Banks [Member] JPY (¥)	Dec. 31, 2014 Uncommitted Credit Facilities With A Commercial Japanese Banks [Member] USD ($)	Mar. 31, 2015 Italy, Spain, Portugal and Greece [Member] USD ($)	Mar. 31, 2015 Covenant Requirement [Member]	Mar. 31, 2015 Actual, Covenant [Member]	Apr. 10, 2015 2015 Interim Facility [Member]	Apr. 10, 2015 2015 Interim Facility [Member] USD ($)	Apr. 10, 2015 2015 Term Loan [Member]	Apr. 10, 2015 2015 Term Loan [Member] USD ($)	Mar. 31, 2015 Revolving credit facility [Member] USD ($)	Apr. 10, 2015 Revolving credit facility [Member] USD ($)	Apr. 18, 2012 Revolving credit facility [Member] USD ($)	Mar. 31, 2015 Unsecured Term Loan Facility [Member]	Aug. 06, 2013 Unsecured Term Loan Facility [Member] USD ($)	Apr. 10, 2015 the 2015 Facility [Member]	Apr. 10, 2015 the 2015 Facility [Member] USD ($)	Apr. 10, 2015 the 2015 Facility [Member] Covenant Requirement [Member]	Mar. 31, 2015 the 2015 Facility [Member] Covenant Requirement [Member]	Apr. 10, 2015 the 2015 Facility [Member] Second year [Member]	Apr. 10, 2015 the 2015 Facility [Member] Third year [Member]	Apr. 10, 2015 the 2015 Facility [Member] Fourth year [Member]	Apr. 10, 2015 the 2015 Facility [Member] Fifth year [Member]	Apr. 10, 2015 2015 Term Loan [Member] USD ($)	Mar. 31, 2015 Senior Notes [Member] USD ($)	Mar. 31, 2015 Unsecured Term Loan Facility [Member] USD ($)	Dec. 31, 2014 Unsecured Term Loan Facility [Member] USD ($)
Debt Instrument [Line Items]
Asset Impairment Charges		$ 55
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Current Year	400																											400	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	680																											600	80
Long-term Debt, Maturities, Repayments of Principal in Year Three	330																											250	80
Long-term Debt, Maturities, Repayments of Principal in Year Four	840																											600	240
Long-term Debt, Maturities, Repayments of Principal in Year Five	0																											0	0
Long-term Debt, Maturities, Repayments of Principal After Year Five	1,950																											1,950	0
Long-term Debt, Maturities, Total Repayments of Principal	4,200																										750	3,800	400	400
Summary of compliance with debt covenants
Maximum Leverage Ratio								3.5	2.4													4.5
Minimum interest coverage ratio								3.0	8.0												3.0
Interest coverage ratio																							425.00%	400.00%	375.00%	350.00%
Borrowings and Credit Arrangements (Textuals) [Abstract]
Total debt	4,268		4,262
Line of Credit Facility, Maximum Borrowing Capacity	300										250					2,000				2,000
Interest Margin above LIBOR, Minimum											0.90%		1.00%			0.875%		1.00%		0.90%
Interest Margin above LIBOR, Maximum											1.525%		1.75%			1.475%		1.75%		1.50%
Line of Credit Facility, Current Interest Rate														1.275%					1.30%
Commitment fee percentage										0.175%		0.20%		0.225%					0.20%
Exclusion from EBITDA for Restructuring Charges															620	500
Restructuring charges remaining to be excluded from calculation of consolidated EBITDA														95
Litigation and Debt Exclusion from EBITDA															2,000	2,300
Legal payments and debt remaining to be excluded from calculation of consolidated EBITDA														1,789	1,000
Unsecured Term Loan Facility, Interest Rate During Period											1.325%		1.50%				1.50%
Quarterly term-loan principal payments													38					20
Senior notes	3,800		3,800
Maximum amount of proceeds from sale of finance receivables	306			175	21,000
Average interest rate of de-recognized receivables	5.30%		3.20%
De-recognized receivables	153		167	125		134
Accounts receivable 180 days past due							25
Accounts receivable 365 days past due							10
Average discounted rates of notes receivables				1.70%	1.70%	1.80%
Letters of Credit Outstanding, Amount	$ 58		$ 59