Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	$ 138	$ 111
Cash payments	(67)	(74)
Restructuring charges	294	286
Other	(137)	(185)
Restructuring reserve ending balance	228	138
Layoff Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	96	59
Cash payments	(61)	(63)
Restructuring charges	154	201
Other	(5)	(101)
Restructuring reserve ending balance	184	96
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	42	52
Cash payments	(6)	(11)
Restructuring charges	140	85
Other	(132)	(84)
Restructuring reserve ending balance	$ 44	$ 42