Borrowings and Credit Arrangements (Details) $ in Millions, ¥ in Billions	3 Months Ended			12 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2017 JPY (¥)	Apr. 10, 2015 USD ($)	Aug. 06, 2013	Apr. 18, 2012 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Current Maturities		$ 0
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Year Two		825
Long-term Debt, Maturities, Repayments of Principal in Year Three		366
Long-term Debt, Maturities, Repayments of Principal in Year Four		1,950
Long-term Debt, Maturities, Repayments of Principal in Year Five		0
Long-term Debt, Maturities, Repayments of Principal After Year Five		2,350
Long-term Debt, Maturities, Total Repayments of Principal		5,491
Borrowings and Credit Arrangements (Textuals) [Abstract]
Total debt		5,514		$ 5,484
Line of Credit Facility, Maximum Borrowing Capacity		400		300
Line of Credit Facility, Fair Value of Amount Outstanding		216		$ 60
Maximum amount of proceeds from sale of finance receivables		$ 406
Average interest rate of de-recognized receivables		1.10%		1.80%
De-recognized receivables		$ 156		$ 152
Letters of Credit Outstanding, Amount		44		44
Uncommitted Credit Facilities With A Commercial Japanese Banks [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Maximum amount of proceeds from sale of finance receivables		188				¥ 21.0
De-recognized receivables		$ 154		$ 149
Average discounted rates of notes receivables		1.30%		1.60%		1.30%
Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio		3.75				3.75
Minimum interest coverage ratio		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
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
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
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
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
Actual, Covenant [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio		2.40				2.40
Minimum interest coverage ratio		9.9				9.9
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%
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		$ 468
Litigation and Debt Exclusion from EBITDA							2,000
Legal payments and debt remaining to be excluded from calculation of consolidated EBITDA		$ 728
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			$ 100		$ 150
Revolving Credit Facility [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Year Four		$ 125
Long-term Debt, Maturities, Total Repayments of Principal		125
2013 Term Loan [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal		150		$ 150
2015 Term Loan [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Total Repayments of Principal		600		600			$ 750
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities		0
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Year Two		600
Long-term Debt, Maturities, Repayments of Principal in Year Three		0
Long-term Debt, Maturities, Repayments of Principal in Year Four		1,450
Long-term Debt, Maturities, Repayments of Principal in Year Five		0
Long-term Debt, Maturities, Repayments of Principal After Year Five		2,350
Long-term Debt, Maturities, Total Repayments of Principal		4,400		4,650
Unsecured Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities		0
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Year Two		225
Long-term Debt, Maturities, Repayments of Principal in Year Three		150
Long-term Debt, Maturities, Repayments of Principal in Year Four		375
Long-term Debt, Maturities, Repayments of Principal in Year Five		0
Long-term Debt, Maturities, Repayments of Principal After Year Five		0
Long-term Debt, Maturities, Total Repayments of Principal		750		$ 750
Financing Receivable [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Year Three		216
Long-term Debt, Maturities, Total Repayments of Principal		216
Senior Notes [Member]
Schedule of debt maturities
Long-term Debt, Maturities, Repayments of Principal in Current Year		$ 250
Subsequent Event [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Unsecured Term Loan Repayment	$ 350