Borrowings and Credit Arrangements (Details) ¥ in Millions, $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2016 JPY (¥)	Apr. 10, 2015 USD ($)	Aug. 06, 2013	Apr. 18, 2012 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	250	250
Long-term Debt, Maturities, Repayments of Principal in Year Three	825	825
Long-term Debt, Maturities, Repayments of Principal in Year Four	150	150
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,825	1,825
Long-term Debt, Maturities, Repayments of Principal After Year Five	2,350	2,350
Long-term Debt, Maturities, Total Repayments of Principal	5,400	5,400
Borrowings and Credit Arrangements (Textuals) [Abstract]
Total debt	5,427	5,427	$ 5,677
Line of Credit Facility, Maximum Borrowing Capacity	300	300
Maximum amount of proceeds from sale of finance receivables	$ 400	400
Average interest rate of de-recognized receivables	1.80%		2.40%
De-recognized receivables	$ 169	169	$ 151
Letters of Credit Outstanding, Amount	43	43	44
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 1,572	$ 1,572
November 2015 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	5.50%	5.50%		5.50%
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 400	$ 400
June 2016 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	6.40%	6.40%		6.40%
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 600	$ 600
2025 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	3.85%	3.85%		3.85%
2022 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	3.375%	3.375%		3.375%
2020 Notes [Member]
Schedule of debt maturities
Debt Instrument, Interest Rate, Stated Percentage	2.85%	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	$ 204	$ 204		¥ 21,000
De-recognized receivables	$ 170	$ 170	$ 132
Average discounted rates of notes receivables	1.60%	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		4.5
Minimum interest coverage ratio	3.0	3.0		3.0
Covenant Requirement [Member] | First four fiscal quarter-ends following the closing of the AMS Portfolio Acquisition [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	4.5	4.5		4.5
Covenant Requirement [Member] | Fifth fiscal quarter-end following the closing of the AMS Portfolio Acquisition [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	4.25	4.25		4.25
Covenant Requirement [Member] | Sixth fiscal quarter-end following the closing of the AMS Portfolio Acquisition [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	4.0	4.0		4.0
Covenant Requirement [Member] | Seventh fiscal quarter-end following the closing of the AMS Portfolio Acquisition [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	3.75	3.75		3.75
Covenant Requirement [Member] | Eighth fiscal quarter-end and thereafter following the closing of the AMS Portfolio Acquisition [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	3.50	3.50		3.50
Actual, Covenant [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	2.6	2.6		2.6
Minimum interest coverage ratio	8.8	8.8		8.8
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%		1.50%
Unsecured Term Loan Repayment	$ 150
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	$ 523	$ 523
Litigation and Debt Exclusion from EBITDA					2,000
Legal payments and debt remaining to be excluded from calculation of consolidated EBITDA	$ 1,543	$ 1,543
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%		1.50%
Unsecured Term Loan Repayment	$ 100		$ 150
2013 Term Loan [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	150	$ 150	250
2015 Term Loan [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	600	600	750		$ 750
Senior Notes [Member]
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	250	250
Long-term Debt, Maturities, Repayments of Principal in Year Three	600	600
Long-term Debt, Maturities, Repayments of Principal in Year Four	0	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,450	1,450
Long-term Debt, Maturities, Repayments of Principal After Year Five	2,350	2,350
Long-term Debt, Maturities, Total Repayments of Principal	4,650	4,650	4,650
Unsecured Term Loan Facility [Member]
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	0	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	225	225
Long-term Debt, Maturities, Repayments of Principal in Year Four	150	150
Long-term Debt, Maturities, Repayments of Principal in Year Five	375	375
Long-term Debt, Maturities, Repayments of Principal After Year Five	0	0
Long-term Debt, Maturities, Total Repayments of Principal	750	750	$ 1,000
Offering Completed in May 2015 [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	1,850	1,850
Debt Instrument, Unamortized Discount (Premium), Net	1,831	1,831
2020 Notes [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	600	600
2022 Notes [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	500	500
2025 Notes [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal	$ 750	$ 750