Restructuring Charges- Additional Information (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 Person	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Estimated reduction in workforce due to restructuring (positions)			1,500
Net additional charges (net recovery/gain)	$ 0	$ 23	$ 107	$ 43
Severance
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	0		78	100
Operating lease and consulting costs
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)			29
Maximum
Restructuring Cost and Reserve [Line Items]
Net additional charges (net recovery/gain)	$ 1