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Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	$ 138us-gaap_RestructuringReserve	$ 111us-gaap_RestructuringReserve	$ 134us-gaap_RestructuringReserve
Cash payments	(213)us-gaap_PaymentsForRestructuring	(74)us-gaap_PaymentsForRestructuring	(57)us-gaap_PaymentsForRestructuring
Restructuring charges	453aa_RestructuringReservePeriodExpenses	286aa_RestructuringReservePeriodExpenses	60aa_RestructuringReservePeriodExpenses
Other	(246)us-gaap_OtherRestructuringCosts	(185)us-gaap_OtherRestructuringCosts	(26)us-gaap_OtherRestructuringCosts
Restructuring reserve ending balance	132us-gaap_RestructuringReserve	138us-gaap_RestructuringReserve	111us-gaap_RestructuringReserve
Layoff Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	96	59	77
Cash payments	(191)	(63)	(44)
Restructuring charges	259	201	47
Other	(66)	(101)	(21)
Restructuring reserve ending balance	98	96	59
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	42	52	57
Cash payments	(22)	(11)	(13)
Restructuring charges	194	85	13
Other	(180)	(84)	(5)
Restructuring reserve ending balance	$ 34	$ 42	$ 52

- 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.

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