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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Regulatory Matters, Commitments, Contingencies And Environmental Liabilities [Abstract]  
Schedule of Rent Expense [Table Text Block]
We have certain non-cancelable leases for property and equipment, which require fixed monthly rental payments with typical initial terms of 5 to 15 years, with some having a term of 40 years or more. The table below reflects rental expense under these operating leases included in operating expenses in the accompanying statements of operations, which include contingent rentals, and rental expense recovered through related sublease rental income:
 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
Rental expense(1)
 
$
196

 
$
187

 
$
281

Less: Sublease rental income
 
(25
)
 
(26
)
 
(26
)
Rental expense, net
 
$
171

 
$
161

 
$
255

(1) 
Includes contingent rentals totaling $16 million, $18 million and $20 million for the years ended December 31, 2017, 2016 and 2015, respectively.
Environmental Exit Costs by Cost [Table Text Block]
 
December 31,
 
2017
 
2016
Current
$
35

 
$
26

Non-current
337

 
318

Total environmental liabilities
$
372

 
$
344

Schedule of Future Minimum Rental Payments for Operating Leases
Future minimum lease commitments for such leases are:
Years Ending December 31:
 
2018
$
113

2019
100

2020
96

2021
83

2022
71

Thereafter
606

Future minimum lease commitments
1,069

Less: Sublease rental income
(152
)
Net future minimum lease commitments
$
917