Borrowings and Credit Arrangements (Details) $ in Millions, ¥ in Billions	9 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 JPY (¥)	Oct. 23, 2015 USD ($)	Apr. 10, 2015 USD ($)	Aug. 06, 2013	Apr. 18, 2012 USD ($)
Debt Instrument [Line Items]
Senior notes issued			$ 4,050
Long-term Debt, Current Maturities	$ 0	$ 0
Letters of Credit Outstanding, Amount	44	44	59
Schedule of debt maturities
Payments due in year two	335	335
Payments due in year three	990	990
Payments due in year four	150	150
Payments due in year five	1,825	1,825
Payments due, Thereafter	2,350	2,350
Payments due, Total	5,650	5,650
Borrowings and Credit Arrangements (Textuals) [Abstract]
Total debt	5,677	5,677	4,244
Revolving credit facility	300	300					$ 2,000		$ 2,000
Senior notes	4,650	4,650
Maximum amount of proceeds from sale of finance receivables	392	392
De-recognized receivables	$ 151	$ 151	$ 167
Average interest rate of de-recognized receivables		2.40%	3.20%
Interest Expense		$ 284	$ 216	$ 324
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
Actual, Covenant [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	3.0	3.0			3.0
Minimum interest coverage ratio	6.6	6.6			6.6
2015 Term Loan Facility [Domain]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Long-term Debt, Gross	$ 750	$ 750
the 2015 Facility [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Interest Margin above LIBOR, Minimum							0.90%
Interest Margin above LIBOR, Maximum							1.50%
Current interest rate on revolving credit facility	1.30%
Commitment fee percentage	0.20%
Amount of exclusions from EBITDA related to existing restructuring plans							$ 620
Restructuring charges remaining to be excluded from calculation of consolidated EBITDA	$ 558	558
Amount of exclusions from EBITDA related to future litigation charges and payments							$ 2,000
Legal payments remaining to be excluded from calculation of consolidated EBITDA	1,803	1,803
Amended Definition of Consolidated EBITDA Amount of Legal Exclusion						$ 300
Unsecured Term Loan Facility [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Interest Margin above LIBOR, Minimum								1.00%
Interest Margin above LIBOR, Maximum								1.75%
Long-term Debt, Gross	$ 250	$ 250	400
Unsecured Term Loan Facility, Interest Rate During Period	1.50%	1.50%			1.50%
Unsecured Term Loan Repayment		$ 150
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%
Quarterly term-loan principal payments							$ 38
$600 million, Senior Note [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	6.40%	6.40%			6.40%
Due in 2018 [Member] | Unsecured Term Loan Facility [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Quarterly term-loan principal payments	$ 20	$ 20
Due Q4 2017 [Member] | Unsecured Term Loan Facility [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Quarterly term-loan principal payments	$ 10	$ 10
November 2015 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	5.50%	5.50%			5.50%
January 2017 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 250	$ 250
Debt Instrument, Interest Rate, Stated Percentage	5.125%	5.125%			5.125%
October 2018 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 600	$ 600
Debt Instrument, Interest Rate, Stated Percentage	2.65%	2.65%			2.65%
January 2020 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 850	$ 850
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%			6.00%
May 2020 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 600	$ 600
Debt Instrument, Interest Rate, Stated Percentage	2.85%	2.85%			2.85%
May 2022 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 500	$ 500
Debt Instrument, Interest Rate, Stated Percentage	3.375%	3.375%			3.375%
May 2025 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 750	$ 750
Debt Instrument, Interest Rate, Stated Percentage	3.85%	3.85%			3.85%
October 2023 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 450	$ 450
Debt Instrument, Interest Rate, Stated Percentage	4.125%	4.125%			4.125%
November 2035 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Effective Percentage	7.00%	7.00%			7.00%
Senior notes	$ 350	$ 350
Debt Instrument, Interest Rate, Stated Percentage	6.25%	6.25%			6.25%
January 2040 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 300	$ 300
Debt Instrument, Interest Rate, Stated Percentage	7.375%	7.375%			7.375%
$600 million, Snr Note [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Repayments of Debt		$ 1,830
Premiums, accelerated amortization of debt issuance costs & investor discount costs [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Interest Expense		$ 45
First four fiscal quarter-ends following the closing of the AMS Portfolio Acquisition [Member] | Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio	4.5	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			4.25
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			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			3.50
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	4.00	4.00			4.00
$600 million, Senior Note [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	$ 600	$ 600
Aggregate Unsecured Term Loan Facility [Member] [Domain]
Schedule of debt maturities
Payments due, Total	1,000	1,000
Unsecured Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	0	0
Schedule of debt maturities
Payments due in year two	85	85
Payments due in year three	390	390
Payments due in year four	150	150
Payments due in year five	375	375
Payments due, Thereafter	0	0
November 2015 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes	400	400
May 2022 Notes [Member]
Schedule of debt maturities
Payments due, Total	500	500
May 2020 Notes [Member]
Schedule of debt maturities
Payments due, Total	600	600
Offering Completed in May 2015 [Member]
Schedule of debt maturities
Payments due, Total	1,850	1,850
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	0	0
Schedule of debt maturities
Payments due in year two	250	250
Payments due in year three	600	600
Payments due in year four	0	0
Payments due in year five	1,450	1,450
Payments due, Thereafter	2,350	2,350
Payments due, Total	4,650	4,650	3,800
May 2025 Notes [Member]
Schedule of debt maturities
Payments due, Total	750	750
Uncommitted Credit Facilities With Two Commercial Japanese Banks [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Maximum amount of proceeds from sale of finance receivables	175	175			¥ 21.0
De-recognized receivables	$ 132	$ 132	$ 134
Average discounted rates of notes receivables	1.60%	1.60%	1.80%		1.60%