Borrowings and Credit Arrangements (Details)	3 Months Ended	12 Months Ended									32 Months Ended															3 Months Ended
	Sep. 30, 2013 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 Uncommitted Credit Facilities With Two Commercial Japanese Banks [Member] USD ($)	Dec. 31, 2014 Uncommitted Credit Facilities With Two Commercial Japanese Banks [Member] JPY (¥)	Dec. 31, 2013 Uncommitted Credit Facilities With Two Commercial Japanese Banks [Member] USD ($)	Dec. 31, 2014 Senior Notes [Member] USD ($)	Dec. 31, 2014 Unsecured Term Loan Facility [Member] USD ($)	Dec. 31, 2014 Covenant Requirement [Member]	Dec. 31, 2014 Actual, Covenant [Member]	Dec. 31, 2014 Credit Facility One [Member] USD ($)	Apr. 18, 2012 Credit Facility One [Member] USD ($)	Dec. 31, 2014 Unsecured Term Loan Facility [Member] USD ($)	Aug. 06, 2013 Unsecured Term Loan Facility [Member] USD ($)	Dec. 31, 2014 Uncommitted Credit Facilities With Two Commercial Japanese Banks [Member]	Dec. 31, 2014 November 2015 Notes [Member] USD ($)	Dec. 31, 2014 June 2016 Notes [Member] USD ($)	Dec. 31, 2014 January 2017 Notes [Member] USD ($)	Dec. 31, 2014 October 2018 Notes [Member] USD ($)	Dec. 31, 2014 January 2020 Notes [Member] USD ($)	Dec. 31, 2014 October 2023 Notes [Member] USD ($)	Dec. 31, 2014 November 2035 Notes [Member] USD ($)	Dec. 31, 2014 January 2040 Notes [Member] USD ($)	Aug. 13, 2013 $600 million, Senior Note [Member] USD ($)	Aug. 13, 2013 $450 million, Senior Note [Member] USD ($)	Sep. 30, 2013 $600 million, Snr Note [Member] USD ($)	Sep. 30, 2013 $850 million, Senior Note [Member] USD ($)
Debt Instrument [Line Items]
Senior notes issued			$ 2,200,000,000
Repurchase rate of senior notes issued in ’09 and ’13 in event change-in-control			1.01
Long-term Debt, Current Maturities		400,000,000					400,000,000	0
Letters of Credit Outstanding, Amount		59,000,000	78,000,000
Schedule of debt maturities
Payments due in year two		680,000,000					600,000,000	80,000,000
Payments due in year three		330,000,000					250,000,000	80,000,000
Payments due in year four		840,000,000					600,000,000	240,000,000
Payments due in year five		0					0	0
Payments due, Thereafter		1,950,000,000					1,950,000,000	0
Payments due, Total		4,200,000,000					3,800,000,000	400,000,000
Summary of compliance with debt covenants
Maximum Leverage Ratio									3.5	2.4
Minimum interest coverage ratio									3.0	8.2
Borrowings and Credit Arrangements (Textuals) [Abstract]
Total debt		4,262,000,000	4,240,000,000
Debt Instrument, Interest Rate, Effective Percentage																6.25%						7.00%
Revolving credit facility		300,000,000										2,000,000,000
Interest Margin above LIBOR, Minimum												0.875%		1.00%
Interest Margin above LIBOR, Maximum												1.475%		1.75%
Current interest rate on revolving credit facility											1.275%
Commitment fee percentage											0.225%
Amount of exclusions from EBITDA related to existing restructuring plans												500,000,000
Restructuring charges remaining to be excluded from calculation of consolidated EBITDA											116,000,000
Amount of exclusions from EBITDA related to future litigation charges and payments												2,300,000,000
Legal payments remaining to be excluded from calculation of consolidated EBITDA											2,107,000,000
Long-term Debt, Gross														400,000,000
Senior notes		3,800,000,000	3,800,000,000													400,000,000	600,000,000	250,000,000	600,000,000	850,000,000	450,000,000	350,000,000	300,000,000	600,000,000	450,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																								2.65%	4.125%
Debt Instrument, Interest Rate, Stated Percentage																5.50%	6.40%	5.125%	2.65%	6.00%	4.125%	6.25%	7.375%
Maximum amount of proceeds from sale of finance receivables		363,000,000		175,000,000	21,000,000,000
De-recognized receivables		167,000,000	146,000,000	134,000,000		147,000,000
Average interest rate of de-recognized receivables		3.20%	3.33%
Average discounted rates of notes receivables						1.80%									1.80%
Unsecured Term Loan Facility, Interest Rate During Period													1.50%
Quarterly term-loan principal payments													20,000,000
Repayments of Debt																										600,000,000	850,000,000
Payments of Debt Extinguishment Costs	$ 70,000,000