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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Summary of Impacts of Revisions to the Risk-Free Discount Rate Applied to Environmental Remediation Liabilities and Recovery Assets

The following table summarizes the impacts of revisions in the risk-free discount rate applied to our environmental remediation liabilities and recovery assets during the reported periods (in millions) and the risk-free discount rate applied as of each reporting date:

 

     Years Ended December 31,  
       2016         2015         2014    

Charge (reduction) to operating expenses

   $ (2   $ (2   $ 10   

Risk-free discount rate applied to environmental remediation liabilities and recovery assets

     2.5     2.25     2.00
Schedule of Estimated Useful Lives for Significant Property and Equipment Categories

The estimated useful lives for significant property and equipment categories are as follows (in years):

 

     Useful Lives  

Vehicles — excluding rail haul cars

     3 to 10   

Vehicles — rail haul cars

     10 to 20   

Machinery and equipment — including containers

     3 to 30   

Buildings and improvements

     5 to 40   

Furniture, fixtures and office equipment

     3 to 10   
Summary of Equity and Cost Method Investments

The following table summarizes our equity and cost method investments as of December 31 (in millions):

 

     2016      2015  

Equity method investments

   $ 173       $ 186   

Cost method investments

     147         174   
  

 

 

    

 

 

 

Investments in unconsolidated entities

   $ 320       $ 360   
  

 

 

    

 

 

 
Schedule of Supplemental Cash Flow Information

Supplemental Cash Flow Information

 

Cash paid during the years ended December 31 (in millions):    2016      2015      2014  

Interest, net of capitalized interest and periodic settlements from interest rate swap agreements

   $ 375       $ 384       $ 461   

Income taxes

     442         419         758