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Commitments, Contingencies and Other Items - Lawsuits (Details)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 26, 2013
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2017
USD ($)
property
Loss Contingencies        
Estimated Litigation Liability       $ 88
Number of properties with potential environmental liability | property       180
Peruvian Tax Litigation, Before Interest | Pending Litigation        
Loss Contingencies        
Loss Contingency, Asserted Claim       $ 26
Peruvian Tax Litigation, Income Taxwitholding 2001 and 2002 | Pending Litigation        
Loss Contingencies        
Loss Contingency, Asserted Claim       3
Peruvian Tax Litigation, Vat for 2001 and 2002 | Pending Litigation        
Loss Contingencies        
Loss Contingency, Asserted Claim       7
Peruvian Tax Litigation, Disallowance of VAT in 2005 | Pending Litigation        
Loss Contingencies        
Loss Contingency, Asserted Claim       16
Peruvian Tax Litigation | Pending Litigation        
Loss Contingencies        
Loss Contingency, Asserted Claim       15
Employee Severance and Contractor Termination Disputes | Pending Litigation        
Loss Contingencies        
Loss Contingency, Asserted Claim       29
Brazilian Tax Claims | Maximum | Pending Litigation        
Loss Contingencies        
Loss Contingency, Range of Possible Loss, Portion Not Accrued       $ 53
Brazilian Tax Claims | Brazilian Tax Reserve Release | Pending Litigation        
Loss Contingencies        
Loss Contingency Accrual, Period Increase (Decrease)   $ (3) $ (6)  
Loss Contingency Accrual, Payments   $ 5    
United States of America ex rel., v. Level 3 Communications, Inc. et al. | Pending Litigation        
Loss Contingencies        
Loss contingency, damages sought, value $ 50