Borrowings and Credit Arrangements (Details) ¥ in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2016 JPY (¥)	Apr. 10, 2015 USD ($)	Aug. 06, 2013 USD ($)	Apr. 18, 2012 USD ($)
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Current Year	$ 0
Long-term Debt, Maturities, Repayments of Principal in Year Two	335
Long-term Debt, Maturities, Repayments of Principal in Year Three	990
Long-term Debt, Maturities, Repayments of Principal in Year Four	150
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,825
Long-term Debt, Maturities, Repayments of Principal After Year Five	2,350
Long-term Debt, Maturities, Total Repayments of Principal	5,650
Borrowings and Credit Arrangements (Textuals) [Abstract]
Total debt	5,677	$ 5,677
Line of Credit Facility, Maximum Borrowing Capacity	300
Maximum amount of proceeds from sale of finance receivables	$ 411
Average interest rate of de-recognized receivables	1.70%	2.40%
De-recognized receivables	$ 178	$ 151
Letters of Credit Outstanding, Amount	$ 43	44
November 2015 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	5.50%		5.50%
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 400
June 2016 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	6.40%		6.40%
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 600
2025 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	3.85%		3.85%
2022 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	3.375%		3.375%
2020 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	2.85%		2.85%
Uncommitted Credit Facilities With A Commercial Japanese Banks [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Maximum amount of proceeds from sale of finance receivables	$ 187		¥ 21,000
De-recognized receivables	$ 146	$ 132
Average discounted rates of notes receivables	1.60%	1.60%	1.60%
Extinguished Debt [Member]
Schedule of debt maturities
Interest Expense, Debt	$ 45
Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	4.5		4.5
Minimum interest coverage ratio	3.0		3.0
Actual, Covenant [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	2.9		2.9
Minimum interest coverage ratio	7.0		7.0
2015 Term Loan [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Interest Margin above LIBOR, Minimum				1.00%
Interest Margin above LIBOR, Maximum				1.75%
Unsecured Term Loan Facility, Interest Rate During Period	1.50%		1.50%
Quarterly term-loan principal payments				$ 38
Revolving credit facility [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity						$ 2,000
the 2015 Facility [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity				$ 2,000
Interest Margin above LIBOR, Minimum				0.90%
Interest Margin above LIBOR, Maximum				1.50%
Line of Credit Facility, Current Interest Rate	1.30%
Commitment fee percentage	0.20%
Exclusion from EBITDA for Restructuring Charges				$ 620
Restructuring charges remaining to be excluded from calculation of consolidated EBITDA	$ 547
Litigation and Debt Exclusion from EBITDA				2,000
Legal payments and debt remaining to be excluded from calculation of consolidated EBITDA	$ 1,680
2013 Term Loan [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Interest Margin above LIBOR, Minimum					1.00%
Interest Margin above LIBOR, Maximum					1.75%
Unsecured Term Loan Facility, Interest Rate During Period	1.50%		1.50%
Unsecured Term Loan Repayment		$ 150
2013 Term Loan [Member] | Due Q4 2017 [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Quarterly term-loan principal payments					$ 10
2013 Term Loan [Member] | Due 2018 [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Quarterly term-loan principal payments					$ 20
2013 Term Loan [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	$ 250	250
2015 Term Loan [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	750	750		$ 750
Senior Notes [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Current Year	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	250
Long-term Debt, Maturities, Repayments of Principal in Year Three	600
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,450
Long-term Debt, Maturities, Repayments of Principal After Year Five	2,350
Long-term Debt, Maturities, Total Repayments of Principal	4,650	4,650
Unsecured Term Loan Facility [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Current Year	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	85
Long-term Debt, Maturities, Repayments of Principal in Year Three	390
Long-term Debt, Maturities, Repayments of Principal in Year Four	150
Long-term Debt, Maturities, Repayments of Principal in Year Five	375
Long-term Debt, Maturities, Repayments of Principal After Year Five	0
Long-term Debt, Maturities, Total Repayments of Principal	1,000	$ 1,000
Offering Completed in May 2015 [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	1,850
Debt Instrument, Unamortized Discount (Premium), Net	1,831
2020 Notes [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	600
2022 Notes [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	500
2025 Notes [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	$ 750
Periods prior to the closing of the AMS Portfolio Acquisition [Member] | Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	4.5		4.5
Fifth fiscal quarter-end following the closing of the AMS Portfolio Acquisition [Member] | Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	4.25		4.25
Sixth fiscal quarter-end following the closing of the AMS Portfolio Acquisition [Member] | Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	4.0		4.0
Seventh fiscal quarter-end following the closing of the AMS Portfolio Acquisition [Member] | Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	3.75		3.75
Eighth fiscal quarter-end and thereafter following the closing of the AMS Portfolio Acquisition [Member] | Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	3.50		3.50