Borrowings and Credit Arrangements (Details) ¥ in Billions	9 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Feb. 07, 2017 USD ($)	Dec. 31, 2016 JPY (¥)	Jun. 30, 2016 USD ($)	Apr. 10, 2015 USD ($)	Aug. 06, 2013	Apr. 18, 2012 USD ($)
Debt Instrument [Line Items]
Repurchase Agreement Counterparty, Amount at Risk		$ 1.01
Senior notes issued	$ 4,050,000,000		$ 4,050,000,000
Long-term Debt, Current Maturities		250,000,000
Letters of Credit Outstanding, Amount	44,000,000	44,000,000	44,000,000
Schedule of debt maturities
Payments due in year two		825,000,000
Payments due in year three		150,000,000
Payments due in year four		1,825,000,000
Payments due in year five		0
Payments due, Thereafter		2,350,000,000
Payments due, Total		5,400,000,000
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	5,677,000,000	5,484,000,000	5,677,000,000
Revolving credit facility		300,000,000						$ 2,000,000,000		$ 2,000,000,000
Senior notes		4,650,000,000
Maximum amount of proceeds from sale of finance receivables		391,000,000
De-recognized receivables	151,000,000	$ 152,000,000	$ 151,000,000
Average interest rate of de-recognized receivables		1.80%	2.40%
Interest Expense		$ 233,000,000	$ 284,000,000	$ 216,000,000
Covenant Requirement [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio		4.0				4.0
Minimum interest coverage ratio		3.0				3.0
Actual, Covenant [Member]
Summary of compliance with debt covenants
Maximum Leverage Ratio		2.4				2.4
Minimum interest coverage ratio		9.8				9.8
2015 Term Loan Facility [Domain]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Long-term Debt, Gross	$ 750,000,000	$ 600,000,000	750,000,000					$ 750,000,000
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	1.30%
Commitment fee percentage	0.20%
Amount of exclusions from EBITDA related to existing restructuring plans								$ 620,000,000
Restructuring charges remaining to be excluded from calculation of consolidated EBITDA		485,000,000
Amount of exclusions from EBITDA related to future litigation charges and payments								$ 2,000,000,000
Legal payments remaining to be excluded from calculation of consolidated EBITDA		$ 885,000,000
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%
Unsecured Term Loan Facility, Interest Rate During Period		1.50%				1.50%
Unsecured Term Loan Repayment		$ 150,000,000
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								$ 38,000,000
2013 Term Loan [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Long-term Debt, Gross	$ 250,000,000	$ 150,000,000	250,000,000
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
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
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		4.00				4.00
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
$600 million, Senior Note [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage		6.40%				6.40%
Due in 2018 [Member] | Unsecured Term Loan Facility [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Quarterly term-loan principal payments							$ 100,000,000
Due Q4 2017 [Member] | Unsecured Term Loan Facility [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Quarterly term-loan principal payments		$ 150,000,000
November 2015 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage		5.50%				5.50%
January 2017 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.125%				5.125%
October 2018 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		$ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage		2.65%				2.65%
January 2020 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		$ 850,000,000
Debt Instrument, Interest Rate, Stated Percentage		6.00%				6.00%
May 2020 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		$ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage		2.85%				2.85%
May 2022 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage		3.375%				3.375%
May 2025 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		$ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage		3.85%				3.85%
October 2023 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		$ 450,000,000
Debt Instrument, Interest Rate, Stated Percentage		4.125%				4.125%
November 2035 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Debt Instrument, Interest Rate, Effective Percentage		7.00%				7.00%
Senior notes		$ 350,000,000
Debt Instrument, Interest Rate, Stated Percentage		6.25%				6.25%
January 2040 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		$ 300,000,000
Debt Instrument, Interest Rate, Stated Percentage		7.375%				7.375%
$600 million, Snr Note [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Repayments of Debt		$ 1,830,000,000
Premiums, accelerated amortization of debt issuance costs & investor discount costs [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Interest Expense		45,000,000
$600 million, Senior Note [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		600,000,000
Aggregate Unsecured Term Loan Facility [Member] [Domain]
Schedule of debt maturities
Payments due, Total	1,000,000,000	750,000,000	1,000,000,000
Unsecured Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities		0
Schedule of debt maturities
Payments due in year two		225,000,000
Payments due in year three		150,000,000
Payments due in year four		375,000,000
Payments due in year five		0
Payments due, Thereafter		0
November 2015 Notes [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Senior notes		400,000,000
May 2022 Notes [Member]
Schedule of debt maturities
Payments due, Total		500,000,000
May 2020 Notes [Member]
Schedule of debt maturities
Payments due, Total		600,000,000
Offering Completed in May 2015 [Member]
Schedule of debt maturities
Payments due, Total		1,850,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities		250,000,000
Schedule of debt maturities
Payments due in year two		600,000,000
Payments due in year three		0
Payments due in year four		1,450,000,000
Payments due in year five		0
Payments due, Thereafter		2,350,000,000
Payments due, Total	4,650,000,000		4,650,000,000
May 2025 Notes [Member]
Schedule of debt maturities
Payments due, Total		750,000,000
Uncommitted Credit Facilities With Two Commercial Japanese Banks [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Maximum amount of proceeds from sale of finance receivables		180,000,000				¥ 21.0
De-recognized receivables	$ 132,000,000	$ 149,000,000	$ 132,000,000
Average discounted rates of notes receivables	1.60%	1.60%	1.60%			1.60%
Subsequent Event [Member]
Borrowings and Credit Arrangements (Textuals) [Abstract]
Revolving credit facility					$ 400,000,000