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Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	$ 132us-gaap_RestructuringReserve	$ 138us-gaap_RestructuringReserve
Cash payments	(57)us-gaap_PaymentsForRestructuring	(213)us-gaap_PaymentsForRestructuring
Restructuring charges	30aa_RestructuringReservePeriodExpenses	453aa_RestructuringReservePeriodExpenses
Other	(19)us-gaap_OtherRestructuringCosts	(246)us-gaap_OtherRestructuringCosts
Restructuring reserve ending balance	86us-gaap_RestructuringReserve	132us-gaap_RestructuringReserve
Layoff Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	98	96
Cash payments	(54)	(191)
Restructuring charges	24	259
Other	(13)	(66)
Restructuring reserve ending balance	55	98
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	34	42
Cash payments	(3)	(22)
Restructuring charges	6	194
Other	(6)	(180)
Restructuring reserve ending balance	$ 31	$ 34

- Definition

Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

+ References+ Details