Landfill and Environmental Remediation Liabilities - Liabilities for Landfill and Environmental Remediation Costs (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Site Contingency [Line Items]
Total, Environmental Remediation	$ 223
Current (in accrued liabilities)	127	130
Long-term	1,540	1,518
Total	1,667	1,648
Landfill Liabilities [Member]
Site Contingency [Line Items]
Current (in accrued liabilities), Landfill	92	95
Long-term, Landfill	1,352	1,326
Total, Landfill	1,444	1,421	1,338
Environmental Remediation Liabilities [Member]
Site Contingency [Line Items]
Current (in accrued liabilities), Environmental Remediation	35	35
Long-term, Environmental Remediation	188	192
Total, Environmental Remediation	$ 223	$ 227	$ 253