Schedule of Restructuring Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	11 Months Ended		3 Months Ended	36 Months Ended
	Mar. 31, 2015	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
2014-2018 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	$ 224
Charges	163	437	[1]
Cash spent	(39)
Non-cash settlements	(78)
Currency	(14)
Balance at end of period	256	256
2014-2018 Restructuring Program | Severance And Related Costs
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	224
Charges	85
Cash spent	(39)
Currency	(14)
Balance at end of period	256	256
2014-2018 Restructuring Program | Asset Write-Downs
Restructuring Cost and Reserve [Line Items]
Charges	78
Non-cash settlements	(78)
2012-2014 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	128
Charges	(2)			42	729	[2]
Cash spent	(19)			(28)
Non-cash settlements				(13)
Currency	(5)
Balance at end of period	102	102			128
2012-2014 Restructuring Program | Severance And Related Costs
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	128
Charges	(2)
Cash spent	(19)
Currency	(5)
Balance at end of period	$ 102	$ 102

[1] Includes all charges recorded since program inception on May 6, 2014 through March 31, 2015.

[2] Includes all charges recorded since program inception in 2012 through conclusion on December 31, 2014.