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Interest Margin above LIBOR, Maximum.

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Borrowings and Credit Arrangements (Details) ¥ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Borrowings and Credit Arrangements (Details) ¥ in Millions	Mar. 31, 2017 USD ($)	Dec. 31, 2015 reportablesegments	Dec. 31, 2017 USD ($) reportablesegments	Dec. 31, 2016 USD ($) reportablesegments	Dec. 31, 2015 USD ($) reportablesegments	Dec. 31, 2017 JPY (¥) reportablesegments	Sep. 30, 2017 USD ($)	Aug. 04, 2017 USD ($)	Jun. 30, 2017 USD ($)	Feb. 07, 2017 USD ($)	Apr. 10, 2015 USD ($)	Apr. 18, 2012 USD ($)
Debt Instrument [Line Items]
Number of global reporting units \| reportablesegments		7	7	7	7	7
Repurchase Agreement Counterparty, Amount at Risk			$ 1.01
Senior notes issued				$ 4,050,000,000
Letters of Credit Outstanding, Amount			49,000,000	44,000,000
Schedule of debt maturities
Payments due, Total			(3,815,000,000)	(5,420,000,000)
Summary of compliance with debt covenants
Line of Credit Facility, Fair Value of Amount Outstanding			60,000,000
Borrowings and Credit Arrangements (Textuals) [Abstract]
Total debt			5,616,000,000	5,484,000,000
Debt, Current			1,801,000,000	64,000,000
Revolving credit facility			300,000,000							$ 400,000,000		$ 2,000,000,000
Maximum amount of proceeds from sale of finance receivables			456,000,000
De-recognized receivables			$ 171,000,000	$ 152,000,000
Average interest rate of de-recognized receivables			1.80%	1.80%
Interest Expense			$ 229,000,000	$ 233,000,000	$ 284,000,000
Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio			3.5			3.5
Actual, Covenant [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio			2.2			2.2
the 2017 Facility [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Revolving credit facility								$ 2,250,000,000
2015 Term Loan Facility [Domain]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Long-term Debt, Gross			$ 600,000,000
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		1.10%
Commitment fee percentage		0.15%
Amount of exclusions from EBITDA related to existing restructuring plans											$ 500,000,000
Restructuring charges remaining to be excluded from calculation of consolidated EBITDA			444,000,000
Amount of exclusions from EBITDA related to future litigation charges and payments											$ 2,624,000,000
Legal payments remaining to be excluded from calculation of consolidated EBITDA			1,839,000,000
2013 Term Loan [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Long-term Debt, Gross			$ 150,000,000
November 2035 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Effective Percentage			7.00%			7.00%
Securities Financing Transaction, Cost [Member]
Schedule of debt maturities
Payments due, Total			$ (18,000,000)	(24,000,000)
Interest Rate Swap [Member]
Schedule of debt maturities
Payments due, Total			(38,000,000)	(51,000,000)
Premiums, accelerated amortization of debt issuance costs & investor discount costs [Member]
Schedule of debt maturities
Payments due, Total			(6,000,000)	(8,000,000)
January 2040 Notes [Member]
Schedule of debt maturities
Payments due, Total			$ (300,000,000)	(300,000,000)
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			7.375%			7.375%
November 2035 Notes [Member]
Schedule of debt maturities
Payments due, Total			$ (350,000,000)	(350,000,000)
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			7.00%			7.00%
October 2023 Notes [Member]
Schedule of debt maturities
Payments due, Total			$ (450,000,000)	(450,000,000)
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			4.125%			4.125%
2020 Term Loan [Member]
Schedule of debt maturities
Payments due, Total			$ 0	(600,000,000)
January 2020 Notes [Member]
Schedule of debt maturities
Payments due, Total			$ (850,000,000)	(850,000,000)
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			6.00%			6.00%
2018 Term Loan [Member] [Member]
Schedule of debt maturities
Payments due, Total			$ 0	(150,000,000)
October 2018 Notes [Member]
Schedule of debt maturities
Payments due, Total				(600,000,000)
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt, Current			$ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage			2.65%			2.65%
January 2017 Notes [Member]
Schedule of debt maturities
Payments due, Total			$ 0	(250,000,000)
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			5.125%			5.125%
Aggregate Unsecured Term Loan Facility [Member] [Domain]
Schedule of debt maturities
Payments due, Total				(750,000,000)
May 2022 Notes [Member]
Schedule of debt maturities
Payments due, Total			$ (500,000,000)	(500,000,000)
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			3.375%			3.375%
May 2020 Notes [Member]
Schedule of debt maturities
Payments due, Total			$ (600,000,000)	(600,000,000)
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			2.85%			2.85%
Senior Notes [Member]
Schedule of debt maturities
Payments due, Total			$ (4,400,000,000)	(4,650,000,000)
May 2025 Notes [Member]
Schedule of debt maturities
Payments due, Total			$ (750,000,000)	(750,000,000)
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			3.85%			3.85%
Uncommitted Credit Facilities With Two Commercial Japanese Banks [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Maximum amount of proceeds from sale of finance receivables			$ 195,000,000			¥ 22,000
De-recognized receivables			$ 157,000,000	$ 149,000,000
Average discounted rates of notes receivables			1.30%	1.60%		1.30%
Capital Lease Obligations [Member]
Schedule of debt maturities
Payments due, Total			$ (1,000,000)	$ (1,000,000)
Line of Credit [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Commercial Paper							$ 2,250,000,000		$ 2,000,000,000
Borrowings [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Commercial Paper			$ 1,197,000,000
Commercial Paper [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Short-term Debt, Weighted Average Interest Rate			1.85%			1.85%
Senior Notes [Member]
Schedule of debt maturities
Extinguishment of Debt, Amount	$ 250,000,000