Restructuring Charges- Activity in Restructuring Reserve (Detail) (Operational Efficiency Initiatives 2011, USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended	27 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 80			$ 107
Net additional charges (net recovery/gain)	0	23	107	43
Utilization	(16)			(70)
Ending balance	64	80		80
Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	80			78
Net additional charges (net recovery/gain)	0		78	100
Utilization	(16)			(98)
Ending balance	64	80		80
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	0			29
Net additional charges (net recovery/gain)	0			(57)
Utilization	0			28
Ending balance	$ 0	$ 0		$ 0