Income Taxes - Additional Information (Detail) € in Millions, $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Income Taxes [Line Items]
Provision for income taxes		$ (229)	$ (475)
Discrete tax expense (benefit)		(122)
Cash taxes paid, net of refunds		246	$ 139	$ 520	$ 357
Tax contingencies		$ 1,800		$ 1,800		$ 1,700
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Description of the status of the tax examination	We are under examination, or may be subject to examination, by the Internal Revenue Service (“IRS”) for the calendar year 2005 and thereafter.	We are under examination, or may be subject to examination, by the Internal Revenue Service (“IRS”) for the calendar year 2005 and thereafter.
Tax examination, estimate of additional tax expense		$ 1,500
France
Income Taxes [Line Items]
Description of the status of the tax examination	Certain of our subsidiaries are under examination or investigation or may be subject to examination or investigation by the French Tax Administration (“FTA”) for calendar year 2006 and thereafter.	Certain of our subsidiaries are under examination or investigation or may be subject to examination or investigation by the French Tax Administration (“FTA”) for calendar year 2006 and thereafter.
Tax examination, estimate of additional tax expense | €	€ 196
European Union
Income Taxes [Line Items]
Description of the status of the tax examination	In addition, in October 2014, the European Commission opened a formal investigation to examine whether decisions by the tax authorities in Luxembourg with regard to the corporate income tax paid by certain of our subsidiaries comply with European Union rules on state aid.	In addition, in October 2014, the European Commission opened a formal investigation to examine whether decisions by the tax authorities in Luxembourg with regard to the corporate income tax paid by certain of our subsidiaries comply with European Union rules on state aid.
Other Foreign Jurisdictions
Income Taxes [Line Items]
Description of the status of the tax examination	We are also subject to taxation in various states and other foreign jurisdictions including Canada, China, Germany, India, Italy, Japan, Luxembourg, and the United Kingdom.	We are also subject to taxation in various states and other foreign jurisdictions including Canada, China, Germany, India, Italy, Japan, Luxembourg, and the United Kingdom.
Income Tax Examination, Year under Examination	2008	2008