Landfill and Environmental Remediation Liabilities - Liabilities for Landfill and Environmental Remediation Costs (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Site Contingency [Line Items]
Total, Environmental Remediation	$ 224
Current (in accrued liabilities)	129	130
Long-term	1,532	1,518
Total	1,661	1,648
Environmental Remediation Liabilities [Member]
Site Contingency [Line Items]
Current (in accrued liabilities), Environmental Remediation	35	35
Long-term, Environmental Remediation	189	192
Total, Environmental Remediation	224	227	253
Landfill Liabilities [Member]
Site Contingency [Line Items]
Current (in accrued liabilities)	94	95
Long-term	1,343	1,326
Total, Landfill Liabilities	$ 1,437	$ 1,421	$ 1,338